DICTIONARY Of THE ACTIVE PRINCIPLES OF PLANTS. 



99 



Silver nitrate, crystalline pp., gradually (C^HgNjOo-AgNO.,), charac- 



terislic. 

 Potassium bichromate, clond, then gradual pp. ; amorphous at 1 in 



iiOOO. 

 Phospho-molybdie acid, yellow. 

 Phosphotungstic acid in large excess, slimy pp. 

 Phospho-antimonic acid, cloud 1 in 1,000. 

 [lodo-potassic iodide, cloud, pp. if concentrated.] 

 [Bisrauth-potassic iodide, cloud.] 

 [Not cadmiura-potassic iodide.] 

 [Not mercuric-potassic iodide.] 



.Mercuric chloride, pp. in strong solutions, white crystals ; cloud at 

 1 in 3,000. 

 Colour tests (mostly negative) : 

 ■Concentrated sulphuric acid, colourless (24 hours). 



„ „ ,, with nitric acid, unchanged. 



Concentrated nitric acid, colourless. 

 Friihde's solution, colourless. 



Evaporated with chlorine water, etc. (murexide test), as Theine. 

 (p) CAM ELLIN G., C^jHgjO,,,. From the seeds of Camellia Japonica. 

 Soluble in .alcohol. 

 Feliling's solution, reduced. 

 Concentrated sulphuric acid ( ■■ 

 Concentrated nitric acid ) ''^ ' 



(,/■) ASSAMIN G. From the seeds of Thea Chinensis, var. Assamica. 

 Produces tetanus. 



(.'/) ASSAMIC ACID G., C,,H,,,0|„. Yields Sapogenin (see Saponaria), 

 45'.'>'i |icr cent., and glucose -tJi'Tilj per cent. 



Soluble in water, gelatinous pp. by alcohol. 



Precipitated by neutral and basic lead acetate. 



Concentrated sulphuric acid, yellow^vred^vblue-^^violet. 



Fuming nitric acid, yellow. 



i? -'1'.i. TRIANOSPERMA filicifolia ; Cururhilarew. Brazil. The root. 

 Investigator: Peckolt, Arr!,. P/iarm. [2], 63, 104. 



(u) TRIANOSPERMINE A. Crystallizes and sublimes in needles ; alkaline; 

 sharp tn«te. no odour. 



Soluble ill water and alcohol, not in ether. 



Precipitated by platinic chloride. 



(h) TRIANOSPERMITINE A. Crystalline, sublimable, tasteless, odourless. 

 Soluble in ether, with difficulty in alcohol, not in water. 

 § 2-2(1. TRIGONELLA foenum Grascum ; Li'c/uminosa. The seed. 

 TRIGONELLINE A. (The methylbetaine of nicotinic acid : isomer of Von 

 Gerichten's pyridine-betaine). Crystallizes in flat prisms from alcohol, 

 loses water at 100° and decomposes on further heating. Neutral reaction, 

 deliquescent. 



Very soluble in water. Insoluble in ether, chloroform or benzene. 

 Reactions : 



[No |ip. picric acid.] 

 Red coloration with ferric chloride. 

 [No pp. platinum chloride.] 

 [No pp. mercuric chloride.] 

 §221. TYLOPHORA asthmatica ; Asrlejiiadacea;. Ipecacuanha sub- 

 stitute. East Indies. The root. Investigated by D. Hooper. 



TYLOPHORINE A. Crystalline, alkaline, emetic. Forms neutral salts. 

 Soluble in ether (by which it may be removed from alkaline solutions), 

 sparingh' in water. 



' Precipitated by usual alkaloid reagents.' 

 [No action ferric chloride.] 

 Colour tests : 



Concentrated sulphuric acid, reddish-brown, changing to green, then 

 blue. 

 ^, „ with potass, bichromate, violet-brown. 



,^ „ with potass, permanganate, decoloration. 



Concentrated nitric acid, purplish-red ; portion soluble, with 



orange colour. 

 Concentrated hydrochloric acid, yellow solution. 

 Frijhde's reagent, bright green. 

 §222. TJRECHITIS suberecta; Apori/nacecv (called 'Nightshade' in 

 Jamaica). The leaves. Investigator : Bowrey, Chein. Nevx, 37, lliO. 



(a) URECHITING. CgU j.pg -(- Aq. Cystallizes in needles or four-sided 

 prisms ; very bitter (perceptible 1 in 40,000) ; very poisonous. Gives 

 sugar on treatment with acids. 



Soluble in hot alcohol, easily in chloroform, also in amyl alcohol, ether, 

 benzene, glacial acetic acid ; not in water or dilute alcohol. 



Concentrated sulphuric acid, yellow, changing successively to orange, 

 red, mauve, purple ; oxidizing agents hasten colour changes. 



