50 



PK'TKlNAIiY (ir TllF. AC'llVK PUINCII'LliS OF I'LANTS. 



[Not jihospho-molybdic acid.] 



[Phospho-antimonic acid, cloud at 1 in 1,(HJI); sol. warm, reappearing 



cold.] 

 [Iodo-potas.sic iodide, cloud not permanent.] 

 [Bismuth-potassic iodide, cloud ; pp. in concentrated solutions.] 

 [Not cadmium potassic iodide. 

 [Not mercuric-])otassic iodide. 

 [Not iodine.] 

 Colour tests (authorities differ) : 



Concentrated sulphuric acid, green (greenish-brown, Dragendorff). 

 „ „ „ with bromine, red~»'green with water. 



,, ., „ with nitric acid, pale yellow. 



„ nitric acid alone, colourless ~»- yellow (Nativelle), 



emerald (Homolle. ) 

 Friihde's reagent, dark orange~>-cherry ; in half-hour, brownish-black ; 

 in twenty- four hours greenish-yellow with black flocks ( Dragendorff ). 

 (lo) DIGITOGENIN G.-deriv., C,.,H.,0:,. From preceding and from 

 Digitonin. 



Soluble in 1(1(1 cold or 'd:> parts boiling 'Jl! per cent, alcohol, 3(1 cold or 

 20 boiling chlorofoim, and in 3(1 cold glacial acetic acid (Kiliani). 



(2) DIGITOXIN. [The most important constituent of Digitalis (Kiliani): 

 this denied by Arnaud, see (1).] 



Soluble in hot alcohol and in chloroform ; with difficulty in cold 

 alcohol or ether (insol. Dupuy) ; and not in water or benzene. 



(3) DIGITONIN G., C„Hj„0,7 (Houdas), or C,,.Hj„0„ (Kiliani). Crys- 

 tallizes from 8.'» per cent, alcohol, but amorphous from stronger alcohol ; 

 M.P. 23."i'' (Kiliani) ; kevo-rotatory (-5(1" for a 2'8 per cent, solution in 

 7;"j per cent, acetic acid). Heated with hydrochloric acid on water bath 

 for si.t hours, yields Digitogenin galactose and dextrose, one molecule of 

 each. 



Soluble in all proportions in water when amorphous, but the crystals 

 only dissolve with difficulty : if heated they are more readily soluble, but 

 the substance then gives no crystals on evaporation (Kiliani) ; sparingly 

 in alcohol, :ind not in ether, chloroform, or benzene. 

 Precipitaats : Ammonia. 



Lead acetate, neutral or basic. 

 Tannic acid. 

 Colour tests : 



Concentrated sulphuric acid, red ; violet on dilution. 



(4) DIGITALEIN G. (Neriin V see Nerium ; Schmicdtberg's Digitalein 

 contains, according to Kiliani, seven or eight substances with as much as 

 ()() |ier cent, of Digitonin) ; non-nitrcgenou§, gummy, fusible, bitter. 



Soluble in water (in all proportions, Dragendorft), in ethyl and amyl 

 alcohol', hut sparingly only in ether. 

 Precipitated by tannic acid. 

 Colour tests : 



Concentrated sulphuric acid, no colour (reddish-brown, Dragendorff). 

 Hydrochloric acid at 211", dissolves browni>h-green. 



§ '.13. ECBALIUM tlateriura (E. officinalis ; Squirting Cucnmber; ; 

 Curtirhilufcd . The dried juice (Elaterium album and nigrum). Investi- 

 gator : Walz, .V. .hilirh. Plmnn., 11. 178, and others. 



(-0 ELATERIN U. (Elatin), C^.H^sOi ; crystalline; M.P. 200' ; neutral 

 reaction, bitter, purgative. 



Soluble in ethyl and amyl alcohols, chloroform, and carbon bisulphide 

 in 125 parts boiling water, with difficulty cold, in 21l(i ether, also 

 sparingly in benzene, which removes it, however, from acid solutions. 

 Reactions : 



In alkaline hydrates and ammonia, soluble (acids reprecipitate). 



Insol. alk. carbonates. 



[No pp. lead acetate neutral.] 



Concentrated sulphuric acid, yellow to dark red. 



,, ,, „ with 1 drop phenol, then more acid, 



crimson. 

 Frolide's solution, yellow. 

 (6) ECBALIN B. (Elateric acid ; not to confuse with Ecbolin, see Ergot), 

 C .iiH^jOj ? (Walz); 'requires confirmation' (Hiisemann). Amorphous, 

 resinous, bitter. 



Soluble in water (20 parts), in alcohol and ether ; also in alkaline 

 hydrates. Nitric acid dissolves red with decomposition. 



(.) ELATERID B., C.nHj.Oi., ? (Walz) ; bitter. 

 Soluble in dilute alcohol, not in water or ether. 

 Reactions : Alkaline hydrates, dissolve. 

 [No pp. lead acetate neutral or basic] 

 Pp. tannic- acid, 

 (rf) HYDRO-ELATERIN, C.;„H3„0« ? (Walz); yellow amorphous, not bitter. 

 Soluble in water, alcohol, and ether (which removes it from acid 

 solutions). 



