213 



with diluted siilpliuric acid, for the liquid, obtained l>y this treat- 

 ment, reduces the alkaline tartarate of copper. 



TacaiUilliaC- Exudation of the stem of Bursera tomentosa and 

 of Calophyllum Inophyllum. The resin of the first-named tree is 

 light-brown, opaque, of pleasant odour and of lasting bitter taste ; 

 dissolves almost completely in alcohol. The resin of the other tree 

 is yellowish, smells after lavender, has a slightly acidulous taste ; 

 dissolves readily in alcohol and in alkalies. 



Taig'UiC Acid. The yellow pigment of the Taigu-v^ood of Pai-a- 

 guay, the origin of which is luiknown. Obtained from the wood 

 by means of cold alcohol, and purified by treating repeatedly with 

 alcohol and with ether. — Forms beautiful yellow crystals, turning 

 slowly brown at the air, tasteless; fuses at 135°, volatilises at 180° 

 undecomposed; contains no nitrogen; dissolves in 1000 parts boil- 

 ing water, in 86 parts alcohol of 0.840, in 19 parts ether, in 16 

 parts aceton, in 45 parts benzol, also in sulj^hide of carbon, petro- 

 leum, in alkalies with red colour. 



Tallow, ClllUPSe. The fatty covering of the seeds of Ex- 

 caecaria sebifera (the kernels contain a liquid fat). It yields a 

 greenish- white tallow-like fat, fusing at 44°, and a white one, fusing 

 at 37°; both containing olein and palmitin. 



Tailg'llilliu. The poisonous ingredient of the seeds of Tanghinia 

 venenifera. Is obtained by extracting with ether from the seeds 

 which have been freed by pressing from most of the fixed oil, and 

 by evaporating- the tincture. — Colourless crystals of a very bitter 

 and acrid taste, fusible with a gentle heat, not volatile, insoluble 

 in water, soluble in alcohol and in ether, little afiected by acids or 

 by alkalies. 



Taimaspldic Acirt=C26 Hu On- In the rhizome of Aspidium 

 Eilixmas and some other species. Boil with alcohol of 75 to 80 % 

 and mix the decoction with water, hydrochloric acid and pulverised 

 sulphate of soda, to produce a precipitate, which contains Tannas- 

 pidic and pteritannic acids. Collect this deposit, wash with solu- 

 tion of sulphate of soda, press, triturate with water and digest at 

 60 to 80° with water containing hydrochloric acid, for half an hour, 

 removing thereby ammonia and other bases. Wash the lemnant 

 with water, diy and exhaiist with anhydrous ether, which dissolves 

 the pteritannic acid. Filter, warm the residue with strong alcohol, 

 add a few drops of solution of acetate of lead, throw down the latter 

 with sulphuret of hydrogen (to make the liquid apt for filtering), 

 filter and evaporate the filtrate in a current of hydrogen and at 

 last in a vacuum over sulphuric acid; the Tannaspidic acid thus 

 obtained is pure when it is quite insoluble in water and in ether, 

 but completely soluble in alcohol. — Black-brown, aniorphous, glossy 

 mass, friable to a spaniol-coloured powder, inodorous, of slightly 



