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¹³ Oschinsky, Dorothea, Walter of Henley and Other Treatises on Estate Management and Accounting (Oxford, 1971), p. 419.Google Scholar For a survey of medieval yields see Slicher van Bath, B. H., “The Yields of Different Crops (mainly cereals) in Relation to the Seed c. 810–1820,” Acta Historiae Neerlandica (Leiden, 1967), vol. 2, pp. 78–97.Google Scholar

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¹⁵ Public Record Office, C 134 File 2 (14 and 16) 1 Edw. II; British Library, Stowe MS 936, f. 37; Magdalen College Oxford, Estate Papers 130/16.Google Scholar

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²² This bears out Brandon's 1972 observation that “the use of yield ratios as indexes of medieval productivity is open to serious objections which bring into question their general validity.” “Cereal Yields,” p. 414.Google Scholar

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³³ Farmer, , “Grain Yields on the Wínchester Manors,” p. 565.Google Scholar

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³⁵ Only 5 of the 38 demesnes belonging to the Bishop of Winchester had lower animal ratios than this, and the average for the estate as a whole over the period 1325–1349 was 72.7; see, Farmer, , “Grain Yields on the Winchester Manors,” p. 563.Google Scholar

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³⁷ Overton, , “Crop Yields,” pp. 375–76.Google Scholar

³⁸ Agricultural technology in this area is discussed in detail in Campbell, “Agricultural Progress.”Google Scholar

³⁹ Ibid.