I

In June 1711, James Petiver travelled to Holland as Hans Sloane's agent, acting as his representative in the sale of the botanist Paul Hermann's collection of natural historical specimens. A London apothecary and natural historian, Petiver was the overseer of the Chelsea Physic Garden, a Fellow of the Royal Society of London, and a prominent figure in British medical and natural historical circles. From his premises at the sign of the White Cross on Aldersgate Street, he oversaw a correspondence extending across Britain, Europe, and the West and East Indies trade. He assiduously cultivated correspondents, acting to place Scottish and other medical apprentices in the Indies trade, while instructing and encouraging collectors in his network.Footnote ¹

Despite his extensive correspondence, Petiver was himself a cautious and infrequent traveller. The trip was one of few occasions when he left London, let alone England, lured by the sale of Hermann's collection by his widow. A sale catalogue publicized the extent of the collection, drawn from Hermann's oversight of the Leiden Physic Garden and its connections with the Indies trade, and detailing the ‘exotics’, animal and vegetable, some preserved ‘in liquore Balsamico’.Footnote ² Petiver embarked in the first week of June for Leiden. ‘Last night (I thank God) I came safe and with very good company to Harwich where we found the town full of passengers bound for Holland’, he reported to his patron and colleague, Sloane. ‘We are now very busy in laying in our stores of provision although we hope for a quick passage & that we may be in Holland tomorrow.’Footnote ³

Petiver took the occasion of his trip to draft an informal will, naming Sloane as his executor. To Sloane, his fellow collector, Petiver bequeathed ‘all my collections of naturall things whatsoever … and all my manuscripts relating thereto’. He envisioned a series of additional bequests, to be funded by the sale of his printed books. He asked that £100 be left towards ‘the discovery and collecting natural productions’, to be kept in the museum of the Royal Society of London. A further £100 was earmarked for the Chelsea Physic Garden, overseen by the Society of Apothecaries. This bequest was intended not only to fund collections, but to ‘encourage and promote the monthly botanic herbarizings & lectures of botany’. Petiver imagined his bequests in great detail, outlining an administrative structure, detailing its oversight by a committee formed by Sloane and the Royal Society, and choosing apothecaries to manage the garden.Footnote ⁴

What did it mean to be preserved in liquore Balsamico? When Thomas Browne described balsam in his Hydriotaphia: urne-buriall (1658), it was metaphorically, for the ‘noble acts, which are the balsame of our memories’.Footnote ⁵ Balsam was used in this general sense to refer to a preserving balm, the usages of which encompassed a broad range of meanings from the metaphorical – the ‘balsamic’, the ‘balm of Gilead’ – to medical balms to heal and preserve the body, to alchemical and magical agents of preservation. What Petiver, as an apothecary, described as ‘balsamic liquor’ could easily be taken by his readers to refer to a broad category of preservation agents, from the liquid dripping from mummies, to medical prescriptions, to the recipes used to stabilize wet collections, keeping the still fleshy natural historical or anatomical specimens intact and resistant to decay.Footnote ⁶

By the early eighteenth century, the wet collection was a mark of virtuosity, often displayed in glass containers, housed in glass-fronted cabinets. Alcohol was useful as a means to transport specimens from the point of collection, and also acted as an important mechanism of long-term preservation and display. As a preservation agent, ‘liquore Balsamico’ became particularly desirable when used in the newly available jars of clear flint glass, commercially produced in England from at least 1673.Footnote ⁷ Preserved in alcohol and housed in glass, the specimen became at once stable and dazzlingly visible.

This article highlights the fact that, alongside its other roles in the early modern British empire, alcohol was an active force in imperial scientific culture in its role as medium of preservation and display. Petiver's collecting depended on the Indies trade, and on his ability to enlist medical apprentices and other skilled, ship-bound collectors as his agents, following his instructions on how to collect and preserve natural historical commodities.Footnote ⁸ The rum and arrack that Petiver recommended to his agents in the Indies trade were used, in turn, as fixing agents for collections sustained by that trade, preserving and displaying these specimens for an audience of the curious in Britain and Europe. In this particular context, and distinct from its role in those other spheres of production and consumption discussed in this issue, alcohol acted as a medium, a means by which the specimen was activated for its audiences, presented in its ‘lifelike’ form.Footnote ⁹ Preserved in spirits, housed in glass, and viewed in the cabinet or the copperplate engraving, the natural historical specimen was a persuasive and mobile form of scientific evidence.

As the articles in this issue argue, intoxicants underpinned European global expansion and expropriation: as staples driving the profits of colonial ventures (as in the case of tobacco and sugar) or as commodities framing exchanges with indigenous peoples or the ‘welfare’ of European planters and soldiers (as in the case of alcohol). When used as a preservative, however, alcohol facilitated European imperialism of a different kind: the seizure and transportation of foreign creatures and their re-categorization as the performative specimens of a Western natural historical system of classification by which that same imperial epistemic and geographical expansion was justified. When alcohol worked as a preservation medium, it activated the specimen of empire in ‘lifelike’ form.Footnote ¹⁰

This article takes Petiver's and his agents’ interaction with their natural historical colleagues in Leiden and Amsterdam as its particular focus, asking what qualities made preservation in alcohol particularly persuasive for collectors and consumers. Petiver's published instructions to his collectors offer insight into the practices of collecting, as well as the expectations that governed the reception and publication of specimens once they had reached the patron. The article turns to the early history of preservation in alcohol in England, and particularly the work of Robert Boyle in promoting the wet collection. It then follows Petiver's agent, Richard Bradley, on his visit to Leiden and Amsterdam in 1711, examining the ‘lifelike’ qualities that preservation in alcohol was meant to grant its subject. Alcohol bestowed qualities on specimens that rendered them more persuasive as instruments of scientific evidence, particularly when the specimen was made present through copperplate engravings in published catalogues or treatises.

II

In 1711, Leiden was one of the centres of the natural historical world, and the sale of Paul Hermann's collection a celebrity highlight. Since its founding in 1594 under the direction of Charles de l'Escluse (or Clusius), the physic garden had been known as one of the key natural historical collections. Some 1,585 plant names were listed in the first catalogue of the garden's contents, the Index stirpium of 1594–5.Footnote ¹¹ The garden itself (alongside the anatomy theatre, university library, and fencing school) was the subject of one of four engraved plates, published in 1610 and appearing in copies in other works.Footnote ¹²

By 1711, when Petiver visited, some 3,700 plants had been listed in the most recent catalogue of the garden's contents.Footnote ¹³ The Leiden Physic Garden had a long history of friendship with the Chelsea Physic Garden, following Hermann's visit to London in 1682.Footnote ¹⁴ Hermann had served with the Dutch East India Company, forming collections in Sri Lanka. He ended as the professor of botany at the University of Leiden, where he oversaw the medical garden. His extensive specimen collections came up for auction in 1711, several years after his death in 1695.

With his characteristic eye for detail, Petiver offers an account of the sale in a letter to Sloane. At eight in the morning, he writes, he went to Madame Hermann's auction,

‘Spirits & glasses’ were an important mechanism by which collections were made visible, rendered immediate to their audiences. As a fixing agent, alcohol enabled preservation within any container: jarred specimens figure regularly in inventories of late seventeenth- and eighteenth-century collections, alongside accounts of the cost of the spirits and the jars themselves.Footnote ¹⁶ Yet as the medium for display specimens, shown ‘lifelike’ in glass in collections or engravings, alcohol also acted as a persuasive or rhetorical instrument. In this capacity, as an agent of translation, it assisted in the performance of a particular type of identity, one in which the biological commodity was made to act as a specimen, ontologically resituated within the imperial epistemic project of natural history.

Petiver had issued one of the first practical guides to collecting specimens. His printed broadside with instructions – the Brief directions for the easie making and preserving collections of all natural curiosities (1709?) – was one of several he produced to instruct collectors in the tools and methods for gathering useful specimens.Footnote ¹⁷ In this practical guide, he emphasized the care required in collecting and transporting useful specimens. Humidity and damp, jostling, and breakage were only a few of the hazards to the travelling specimen. Specimens were instruments, acting as iterations of an abstract natural historical concept. Like an imperfect copy of a book, they could fail to transmit their identity to their audiences. The too partial or fragmented specimen; one that was inadequately or incorrectly identified; one that was confused with other specimens or collected without contextual identification: these could fail as instruments of natural historical representation. At their most valuable, however, specimens survived intact, readily identifiable within the context of the collector's own specimen garden, collection, or reference works. Petiver's own collections were extensive and notoriously disorganized, his obsessiveness as collector and correspondent leading him to acquire both entire specimens and their cut-rate counterparts, the bits of flower, leaf, coral, or mollusc that might extend his collection but prove entirely unidentifiable.Footnote ¹⁸

The Brief directions is one of the first guides to recommend the use of spirits for preservation. Petiver begins by directing collectors to keep ‘All small Animals or Beasts, Birds, Fishes, Serpents, Lizards, and other Fleshy Bodies capable of Corruption’ in ‘Rack, Rum, Brandy; or any other Spirits’. Where spirits were not available, he instructed that sea water or a ‘strong Pickle’ of brine, salt, and powdered alum should be substituted. ‘And so send them in any Pot, Bottle, box, &c. close stopt, Cork'd and Rosin'd.’ Small birds could also be kept in spirits, as could ‘all large pulpy moist Fruit, that are apt to decay or rot’. Insects could be ‘Drowned altogether, as soon as Caught: in a little wide Mouth'd Glass, or Vial, half full of Spirits, which you may carry in your Pocket’.Footnote ¹⁹

While ‘Fleshy Bodies capable of Corruption’ – animals, birds, fish, snakes, lizards, fruits, and insects – could be preserved in spirits, plants were to be dried. Again, Petiver offers detailed instructions on how to collect, directing his reader to put plant specimens into a ‘Book, or Quire of Brown Paper stitch'd (which you must take with you) as soon as gathered’. These were to be periodically moved into ‘fresh Books, to prevent either rotting themselves or Paper’. Petiver's instructions came to reflect common practice in the later eighteenth century, as witnessed by the specimens from Joseph Banks's voyage on the Endeavour, preserved in the sheets of an unbound copy of Addison's Notes upon the twelve books of Paradise Lost.Footnote ²⁰

Collectors were expected to gather specimens for dry and wet collections. For herbaria and dried collections, Petiver advised his agents to carry quires of paper in which to collect, a notebook for observations, a trowel to dig roots and specimens, and ‘sheets of wast paper to wrap your seeds or fruit in with … a little packthread and a knife’.Footnote ²¹ For other specimens, he recommended ‘drowning’ in spirits or brine, carrying a jar of ‘strong brine or sea water (which is the best way I can at present think of to preserve their shape and colour)’.Footnote ²² He urged his apprentice agents to organize their collections, gathering further parts (leaves, flowers) of a specimen to facilitate later comparison and illustration.Footnote ²³

When Petiver issued his instructions for collecting in the 1690s, drowning, or the creation of wet collections, was becoming an established preservation practice. Collectors varied their approach, but the fundamental principles remained consistent: storing specimens in alcohol or sea water in a closed container. Different kinds of alcohol were used: rum, arrack, brandy, spirits of wine, aqua vitae, and others. The natural historian René-Antoine Ferchault de Réaumur advised his colleague to add sugar to diluted spirits of wine:

Used to ‘drown’ specimens in the ‘graveyard’, alcohol acted as an instrument of field preservation, stabilizing and conveying specimens from the point of collection to their receipt by the collecting agent's patron or buyer.

III

Petiver drew on an existing tradition of pickling as a visual medium in English natural history. He refers his reader to Robert Boyle's General heads for natural history, proposed to travellers and navigators of 1692.Footnote ²⁵ Boyle, an early proponent of preservation of natural historical specimens in alcohol, particularly emphasized the use of spirits of wine as a visual aid. In a letter to the Philosophical Transactions in 1665, he refers to the utility of preserving foetal specimens in spirits of wine, extending this to the observation of eggs. He is explicit in proposing this as a visual device, a mechanism for rendering embryonic formation visible for his own observation and that of his friends:

Boyle gives instructions on ‘imbalming’, recommending the addition of sal ammoniac for more developed foetal specimens, and using spirits of wine to wash the specimens when removed from the egg. He discusses the issue of colour and discoloration. And he recommends soaking specimens for several hours in ‘either the same kind of Spirit, or better’, so that the ‘Liquor, having drawn as it were what Tincture it could, the Foetus being remov'd into more pure and well dephlegm'd Spirit of Wine, might not dis colour it, but leave it almost as limpid, as before it was put in’.

This letter drew on Boyle's earlier methodology, published in his Some Considerations Touching the Usefulness of Experimental Natural Philosophy (1663). In the mid-seventeenth century, when Boyle first recommended the use of spirits of wine, with its ‘balsamic faculty’, he emphasized the visual role of the liquid agent: ‘for this Liquor being very limpid, and not greasy, leaves a clear prospect of the bodies immersed in it’.Footnote ²⁷ Boyle introduced visual preservation as a property of spirits of wine, describing his experiment with preserving the ‘shine’ of a rotting fish.Footnote ²⁸

When Petiver emphasized that Paul Hermann's specimens had sold ‘not for what the spirits & glasses cost’, he articulated the critical importance of the medium and container to the natural historical specimen's ability to perform itself for its audiences. The container was an essential component of the wet collection. For collecting, as Petiver's instructions indicate, any type of vessel or pot could be used. For display, however, glass played an increasingly important role over the course of the seventeenth century, for the specimen collection as for the microscope, telescope, or other optical technology. In England, the development of flint glass by George Ravenscroft, and its patenting in 1674, led to a radical change in the size, price, and availability of glass displays. Robert Hooke visited Ravenscroft's glasshouse in the Savoy, London, writing about the visit in his diary entry for 29 July 1673.Footnote ²⁹ Boyle's letter on preserving in spirits of wine appeared in the Philosophical Transactions in the company of a review of Hooke's Micrographia. In this, the reviewer argues, ‘a new visible world is discovered by this means, and the Earth shews quite a new thing to us’; with the microscope ‘we may perhaps be enabled to discern the secret workings of nature, almost in the same manner, as we do those that are the productions of art’.Footnote ³⁰ The ‘new visible world’ was one increasingly displayed in glass containers, as it was viewed through glass lenses, glass mirrors, glass-doored cabinets, and glass windows. When Petiver described the cost of ‘spirits and glasses’ at the sale, he was also highlighting the interdependence of the two commodities within the consumer culture of natural history, a point reinforced by historians of alcohol in the discussions of alcohol consumption and the early modern market for drinking glassware.Footnote ³¹

IV

After the sale, Petiver returned to Amsterdam to make spend more time with one of the most influential practitioners of the specimen display, Frederik Ruysch, a Dutch physician and anatomist. Ruysch had become Amsterdam's praelector of anatomy in 1667, a role he energetically assumed, performing over thirty public demonstrations over the course of his career.Footnote ³² From 1685, he was professor of botany at the Hortus botanicus in Amsterdam.Footnote ³³ His powerful influence as anatomical demonstrator was documented by Jan van Neck in his painting The anatomy lesson of Dr. Frederick Ruysch (1683).Footnote ³⁴ Ruysch himself publicized his botanical and anatomical collections in his catalogues and serial publications, including the Hortus Amstelodemensis (1697, edited with Frans Kiggelaer), the Thesaurus anatomicus (1701–16), and the Thesaurus animalium (1710).

When Petiver visited in 1711, Ruysch had become famous for his wet collections, the embalmed specimens, human and natural, displayed in glass and often decorated with ornate tableaux formed of the material from other specimens. These tableaux were re-purposed from Ruysch's earlier collections, the predominantly dry collections of specimens that were his primary focus until around 1701.Footnote ³⁵ By the time of Petiver's visit, Ruysch was renowned for the embalmed collections displayed in the Theatrum animalium (1710), with its idealized rendition of the salon in Ruysch's house on the Bloemgracht (Figure 1). Here the collector and his visitor, classically depicted, enact the performance of the collection's demonstration. The collection itself is depicted in some seven standing cabinets, one prominently open to reveal row upon row of neatly displayed glass jars, their contents too remote to view. The specimens themselves appeared in the Theatrum animalium in a series of engraved tables (Figure 2). Ruysch's daughter Rachel, an accomplished botanical artist, constructed many of the tableaux of shells, eggs, gallstones, blood vessels, skeletons, lace, caps, feathers, and cuffs by which specimens were sometimes ornamented.Footnote ³⁶

Figure 1. Specimens displayed in glass jars, in glass-fronted cabinets in Ruysch's representation of his house museum.

Source: Frederik Ruysch, Opera omnia anatomico-medico-chirurgica, vol. 1 (Amsterdam, [1725]), frontispiece. From the collections of the Wellcome Library.

Figure 2. An engraved table depicting Ruysch's carefully arranged specimens, preserved in ‘balsamic liquor’ and displayed in glass.

Source: Frederik Ruysch, Thesaurus animalium primus (Amsterdam, 1710), table VII. From the collections of the Wellcome Library.

While Ruysch showed his collection to visitors such as Petiver, it was primarily through the medium of print that the embalmed specimens and the collection they represented reached a broader virtuosic audience.Footnote ³⁷ Some features of his technique, such as the specimens’ vivid retention of colour, were highlighted by correspondents and visitors but only manifested in print if added through hand-colouring of an individual engraving. Engaged for at least a decade in trying to sell his collection, Ruysch was reluctant to reveal his embalming technique. The Scottish surgeon Archibald Adams, writing to Sloane in 1707, informed him of Ruysch's willingness – if Sloane or any ‘British subject, corporation or college’ were to acquire the collection – to ‘make me as perfect as himself in the art of embalming, injecting & preserving in animated bodys’.Footnote ³⁸

V

In May 1714, some three years after his patron's visit, Richard Bradley travelled to the Netherlands as Petiver's agent. Writing with characteristic buoyancy, and under a false name and credentials, he said of his first visit to Ruysch in Amsterdam that ‘’tis with Difficulty (notwithstanding my great skill in opticks) that I had hitherto preserv'd my eyesight, the Darling Beauties of those Cabinets I have seen are sufficient to blind the World’.Footnote ³⁹ Bradley had tremendous admiration for Ruysch's collection, which he observed in between his labours in the Amsterdam Physic Garden, collecting seeds and specimens to send, alive and dried, back to Petiver, Sloane, and the waiting audience of collectors.

Bradley was a skilled botanist and illustrator, as interested in the representation of specimens as in the specimens themselves.Footnote ⁴⁰ He spoke highly of the work of Maria Sibylla Merian, the great natural historical painter, writing that she had ‘3 times feasted me with the light of her curious paintings’.Footnote ⁴¹ Merian had visited the Dutch colony of Surinam with her daughter in 1699 to illustrate the process of insect metamorphosis, publishing her Metamorphosis insectorum Surinamensium in 1705.Footnote ⁴²

Bradley wrote to his patron of his activity in copying the collections of Ruysch, Merian, and others, even as he busily attempted to gather cuttings and seeds. ‘Dr Ruysch visits me twice a day and brings me of his most curious subjects to copy’, he said in October 1714.

Two weeks later, Bradley wrote again to describe the living and embalmed specimens in Ruysch's collection, saying that he had

Bradley listed the specimens he was in the process of illustrating – cinnamon, pepper, coffee, aloe – and his choice from the boxes of butterflies and other specimens that Ruysch sent to him to draw while he recuperated from an illness.

Ruysch was extremely motivated to offer specimens to Petiver and Sloane, through the medium of their agent. He would eventually sell his collection to Peter the Great in 1717, but in 1711 (when Petiver visited) and 1714 (during Bradley's visit), he was still hopeful of finding a buyer in Sloane or another British collector. Like Adams before him, Bradley wrote to Petiver to convey Ruysch's offer to teach him his embalming secrets:

The practice of preserving ‘all sorts’, as Bradley knew, was of particular value when those sorts could be kept in ‘as full beauty as when alive’.

VI

The specimen moved between genres: it was given immediacy, rendered lifelike, through the collection (wet or dry), through metadata, through textual descriptions, through visual renderings, and through the imperfect, fragmentary, or unidentified. The garden was obviously one of the key private or institutional collection locations in which specimens were remediated from one format into another, seed or cutting into living cultivar. Bradley was attentive in his correspondence to his patrons’ desire for specimens to plant in their gardens: Mary Somerset, dowager duchess of Beaufort, was a particularly interested consumer of boxes of specimens, as were Petiver, Sloane, and Robert Balle.Footnote ⁴⁶ Sloane and Petiver collected for the Chelsea Physic Garden, Somerset for her garden at Badminton, Balle for his garden at Camden House.

But Petiver's most urgent use for Bradley's specimens (and those of his other correspondents) lay in the production of his serial publications, the ephemeral Musei and Gazophylacii, issued in decades, that he sent with his agents to distribute to potential patrons, collectors, and other likely readers. He published catalogues for his correspondents: ‘A very grateful thing’, wrote Jacob Bobart from the Oxford Physic Garden of one of Petiver's list of the contents of the Chelsea Physic Garden.Footnote ⁴⁷ These publications acted to advertise both Petiver's collection and his network of patrons and collectors, the printed dedication labels designed to be cut out and tipped onto the sheet for their recipient. Petiver used the serials to entice collectors into correspondence, while also advertising new specimens in his possession. In all cases, the visual was an essential accompaniment to the textual description, rendering the presence of the specimens and collection for their reader – and, in many cases, in preferable form to the jumbled and dishevelled set of specimens that visitors sometimes complained of finding in Petiver's actual premises on Aldersgate Street in London.

The superiority of Ruysch's specimens – and of Merian's and Bradley's copies – were particularly appealing to natural historians, like Petiver, who were closely engaged in print. Not all visual evidence was created equal: ‘cuts’, or engravings, and Petiver's in particular, were often judged to be of inferior quality. In 1712, William Greene wrote to Petiver about his meeting with Antoine de Jussieu, keeper of the Jardin des Plantes in Paris. ‘He is one of the most jealous men alive’, wrote Greene, nervously apologizing for Jussieu's contempt for Petiver's publications. ‘His objection against your English herbal was the smallness of the cuts, and in your Gazoph: Nat et artis the fault lay in the graving.’Footnote ⁴⁸ Cheaply printed with scattered engravings, Petiver's miscellanies were not infrequently despised by their continental recipients.Footnote ⁴⁹

In this context, preservation in spirits offered several significant advantages, both material and epistemological, to natural historical practitioners. Spirits immobilized the specimen, capturing it both in time and within a fixed space, the glass in which it would be endlessly and reliably visible to its observers. As Ruysch's preparations reveal, the skilled ‘embalming’ or ‘drowning’ could ensure the retention of a living colour, a persuasively lifelike appearance. The specimen – inert, ‘balsamic’ – was able to act as synecdoche of its broader natural historical category, to be available, on demand, to resemble the living example that was so often unattainable or unmanageable in the broader natural historical environment. Spirits, as medium of preservation, enabled the translation of natural historical object into specimen – one, moreover, both persuasive and inert enough to be easily translated into print culture. Ruysch's embalmed specimens, with their re-purposed anatomical and botanical decorations and ornaments, achieved their greatest and longest-lived influence in print, captured in spirits, in jars, in the pages of his catalogues.

As Boyle had argued, preservation in spirits created the essential natural historical quality of ‘readiness’, the ability to be used, on demand, for observation. He wrote of his specimens in spirit of wine, ‘Which I did that so I might have them in readiness, to make on them, at any time, the observations, I thought them capable of affording; and to let my friends at other seasons of the year, see.’Footnote ⁵⁰ It was through its capacity to make ‘ready’, to preserve and activate the biological commodity as natural historical specimen, that alcohol facilitated European imperialistic collecting. In the ‘spirits and glasses’ of virtuosic display, alcohol was also used to publish and disseminate those specimens, to render the products of European imperial expansion ‘lifelike’, preserved ‘in liquore Balsamico’.