DICTIONARY OF THE ACTIVE PRINCIPLES OK PLANTS. 



97 



(r') LYGUSTRON B. ; needles; M.P. rather over 100° C, distils at 

 •ir)0°-'280': neutral, bitter. 



Soluble in water, alcohol and ether. 



Keduces ammoniacal silver nitrate. 



§ 214. TARAXACUM (Leontodon Taraxacnm, L. ; Dandelion) ; Com- 

 }niK/t(i: The juice. Polex, Ai'cli. Fliiirm., 19, 50 ; Kromayer, Arch, 

 riiurm. [-J], 105, (■.. 



TARAXACIN B. ; crystalline ; readily fusible ; non-volatile ; neutral, bitter. 



Soluble in hot water, difficultly cold ; dissolved also by ether, which 

 removes it from aqueous solutions. 



[Not precipitated by basic acetate of lead — Kromayer.] 



§ 21:"). TAXUS baccata (Yew); Tar,area: Investigators: Hilger, 

 Marmc, etc. 



(ii) TAXINE A., C3.H,,„0,„N. Amorphous? (crystalline, Marme) ; M.P. 

 80°-82' ; evolving aromatic odour ; bitter. 



Soluble readily in alcohol and ether ; also in chloroform (not as readily 

 as 111 ether) ; in benzene (Hilger says insoluble in benzene) and carbon 

 bisulphide ; water dissolves traces. Insoluble in petroleum ether. 



Removed from alkaline solutions by benzene (see note above). 



Precipitants (slightly acid aqueous solution of T.) 



Alkaline hydrates. 



Auimonia. 



Picric acid. 



Platinum chloride. 



Sodium phospho-molybdate. 

 Colour tests : 



Concentrated sulphuiic acid, intense purplish-violet. 



,, nitric acid, yellowish-brown (colourless, Marme 



Frohde's solution, reddish-violet. 

 (/>) MILOSSINE A. ; crystalline ; M.P. 8r)°-87°. 

 Soluble in alcohol, not iu water. 

 § 2in. TEUCRIUM fructicans ; LahiaUv. 

 (•'a:z. Chilli.. 8, 440. 



TEUCRIN G., a,H„,Oii ; crystalline ; M.P. 22.')''-230°. 

 Soluble in alcohol. 

 Acids give sugar and an organic acid. 



§ 217. THALICTRUM macrocarpum ; Ranuiiculacerr. Investigators: 

 Henriot and Doassans, Bull. So,-. Chim., 34, 83. 



[Not gold chloride ? Hilger says 



lodo-potassic iodide ) •bUow 

 Bismuth-potassic iodide 1 ^ 

 [Not mercuric chloride.] 



Investigator : Ogliario, 



(r() MACROCARPINE A. ; per centage composition, C SS'Sfi H 5-87 ; crys- 

 tallizes in yellow needles : blackens on heating to 150° ; optically 

 inactive ; neutral reaction ; stable in presence of acids ; otherwise de- 

 composes at 1(^0°. 



Soluble in alcohol, better in amyl alcohol ; not in water or ether. 

 Reactions : 



Alkaline hydrates decompose to resinous mass. 

 [Not precipitated by basic lead acetate.] 

 Silver nitrate precipitates the pure base. 

 [Fehling's solution not reduced.] 

 [No reaction Iodine tincture,] 



(i) THALICTRINE A. ; crystallizes in radiating needles ; alkaline ; action 

 like Acouitine. 



Soluble in alcohol, ether, or chloroform ; scarcely in water. 



' Gives alkaloid reactions.' 



Concentrated sulphuric acid, colourless (?). 



Fuming sulphuric acid, green. 



Concentrated sulphuric acid with nitric acid, deep green. 



§ 218. THEA group. Thea Chinensis (Camellia Thea ; tea); Tern- 

 utro'meriaceir or Onnelliarea-. The leaves. Substances (a), (c), (/), (.7) ; 

 also Xanthine, Hypoxanthine, Adenine, and Quercitrin — for the latter 

 see Quercus. The proportion of (a) is usually from 2 to ?<h per cent. 

 Coffea Arabica (Coffee) ; Cinrhoiiarea' or JRuhiaceii; (<i). about i to U per 

 cent. Ilex Paraguayensis (Paraguay Tea ; Mate), Ai/uifoliai-eii:, (a). 

 Cola or Kola acuminata (Sterculia ; the nut = Kola nut); Stei-ruUwew, 

 (a), ((/). PauUinia sorbilis (Guarana ; the seed) ; Sapimlwew, (a). 

 Lunanea Bichi ; Sterculiacetr, («). Theobroma Cacao (Cacao or Cocoa ; 

 the seed) ; Bi/ttneriacea; or Sterculiaceir, (d) ; also (f). Camellia .Taponica ; 

 the seeds, (e). 



(«) THEINE (Caffeine ; methyl theobromine ; trimethylxanthine) ; 

 C,H,„NjO„ or CH:,N - CH 



CO CNCH;, (E. Fischer). 



CH3N - C:N'**''° 

 Long silky needles containing 1 molecnle H.,0 ; M.P., after loss of water, 

 177°-228° (different observers), partly sublimable without decomposi- 

 tion (a minute portion sublimes at 100° when heated dry, though no 

 perceptible loss in water vapour) ; feebly alkaline, bitter. Cerebral and 



