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XX.—On Dimethyl-Thetine and its Derivatives

Published online by Cambridge University Press:  14 March 2016

Crum Brown  and
E. A. Letts
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Extract

The analogies existing between elements belonging to one “family,” such, for instance, as the nitrogen family or the sulphur family, have long been recognised, and are pointed out and insisted upon even in elementary textbooks; but the very important analogies existing between substances of different quantivalence are apt to be forgotten or overlooked. For illustrations of such analogies we may point to boron and silicon, elements closely resembling one another in themselves and also in their compounds,—differing, indeed, in little else but that the one is triad and the other tetrad. A similar relation exists between gold and platinum.

The elementary substances, sulphur and phosphorus, have many points of similarity: both fuse at a comparatively low temperature, both are transformed by heat into amorphous insoluble modifications, and both have anomalous vapour densities.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 28 , Issue 2 , 1878 , pp. 571 - 582
Copyright
Copyright © Royal Society of Edinburgh 1877

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References

page 572 note * Hofmann, , “Proceedings of the Royal Society of London,” xi. 525Google Scholar.

page 573 note * If lightly corked, the flask, unless strong, may burst inwards owing to the absorption which occurs.

page 574 note * See pp. 607–611.

page 574 note † It should not be boiled too long with alcohol, otherwise it decomposes slowly.

page 576 note * These quantities represent 1 molecule of the hydrobromate and 1 atom of sodium.

page 577 note * Conveniently rather more than the equivalent weight of nitrate of silver is converted into oxide by addition of potash solution, and the oxide employed without further weighing. (Equal weights of hydrobromate and nitrate of silver were usually employed.)

page 578 note * This silver was probably dissolved by the free bromacetic acid contained in the crude hydrobromate employed for the preparation of the base.

page 578 note † Its products of decomposition are described in a separate paper. See page 598.

page 579 note * The excess of chlorine was probably due to a small quantity of hydrochloric acid enclosed within the crystals, as the specimen analysed was obtained from the base and hydrochloric acid.