Copy 1

The London dispensatory / By Anthony Todd Thomson.

  • Anthony Todd Thomson
Date:
1811
Catalogue details

Licence: Public Domain Mark

Credit: The London dispensatory / By Anthony Todd Thomson. Source: Wellcome Collection.

    53/944
    & 8. Fibrin is tasteless, fibrous, elastic, and resembles gluten. It is insoluble in water and alcohol; but is soluble in ni- tric acid and in diluted alkalies. It soon putrefies. 9. Extractive hasa strong taste; is solublein water and a!- cohol ; but insoluble m ether, unless when united with resin. It is precipitated from its solutions by oxymuri- atic acid, muriate of tin, and muriate of alumina; but not by ao line : 10. Tannin has a bitterish astringent taste; is soluble in water, and in alcohol of 0°810. It 1s precipitated by the muriates of tin and of alumina, and by gelatin. Officinal. Galls, uva ursi, tormentil, rhuLarb, cinchona bare. — simarouba, kino, catechu, willow bark, . Was. (Part i. p. 95.) e. Camphor. an ll. p. 221.) 13. Resins are brittle, eieiks geet vellowish substances, inodorous, and of an acrid taste. Their specific gravity varies from 1:0452 to 1°2289. They melt when heated, inflame in a hicher temperature, and burn with a strong yellow flame, emitting much smoke. They are insoluble in water; but soluble in alcohol, ether, alkalies, and acetic nd _ Nitric acid converts them into artificial tan- nin, : Officinal. Amber, copal, pine resins, mastiche. 14. Guaiacum differs from resins in being soluble in nitric acid, and yielding, when treated with it, oxahe acid, and no fannin. 15. Balsams resemble resins in their appearance; have a strong aromatic odour; yield benzoic acid when heated, or dissolved in sulphuric acid; and when treated with nitric acid yield artificial tanpin, Officinal. _Balsams of tolu, benzoin, storax. odorous, form milky solutions with water, and transpa- rent solutions with alcohol. They are soluble in alkalies ; : and are converted into tannin by’ nitric acid. Oficina]. Ammoniacum, galbaaum, scammony, assafeetida, myrrh, sagapenuni. 17. Wood, which forms the support of all vegetables, is composed of tasteless fibres, insoluble in water and alcos hol; but soluble in weak alkaline ley; and in nitric acid yielding oxalic acid. When distilled per se, ata ted heat, it leaves much charcoal. i, SOLID ANIMAL MATTERS. Gelatin. (Part ii. p. 11. 99.) 2. Allumen when dried is a brittle, transparent, glassy
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