DICTIONARY OF THE ACTIVE PRINCIPLES OF PLANTS. 



Not precipitated by neutral lead acetate. 



§ li>6. NERIUM aiitidysenterica (Wrightia) ; Aporynwc'r. The bark 

 (Cortex conessi ) aud Holarrhcna Africaua, substance («) ; Nerium 

 Oleander and X. odoium, substance (//). 



(a) CONESStNE A. (Wrigbtine), C,„H„„lSr ; whitish powder or brownish- 

 yellow, resinous (crys. needles — Pictet) ; M.P. l'2"i° with sublimate ; 

 bitter, ^alts amorphous. 



Soluble with difficulty in water or alcohol ; scarcely in ether or carbon 

 bisulphide. 



Precipitants : 



Ammonia. 

 Tannic acid. 

 I'latuium chloride. 



Gold chloride. 

 Mercuric chloride. 



(h) OLEANDRINE A. [Neriodorin ? (Schmiedeberg) ; identical with one 

 of Selmi's Ptomaines y (Finoshi). Statements of different observers 

 concerning Oleandrin, Xeriin, Neriodorin, etc., are conflicting ; see 

 Lukowsky, Rep. Cliim. Ajipliq., 3, 77 ; Schmiedeberg, An-liir. c.vp. 

 J'alhi/l., 16, 161 ; Greenish, P/iann. J. Trans., [:5], 11, 873, and others]. 

 Amorphous, yellow, resinous, bitter, poisonous ; M.P. above b6' with 

 crystalhne sublimate; after heating to 240° it is no longer soluble in 

 alcohol or water. 



Soluble (N. are properties ascribed to ' Xeriodorin ') in water, Betelli 

 (scarcely X.), in alcohol, ether (scarcely X'.j, chloroform, fatty oils ; not in 

 benzene (N.), or petroleum ether (X.). 

 Precipitated by ; 



BaMC lead acetate ( X. i. 



Tannic acid. 



Picric acid. 



[Ferric chloride, reddi.sh-brown coloration, X.] 



Platinum chloride. 



Gold chloride. 



Mercuric chloride, white (N.). 

 (<■) NERIIN has all the properties of Digitalein, aud p:ssibly identical 

 therewith. 



(i/) NERIANTHIN bears similar resemblance to Digitalin. 



(<■) ROSAGININ G. (E. Pieszczck) ; nitrogen free ; microscopic crystals? 

 (amorphous. Arrhic. Phanit., 18itO, 228, 3:VJJ ; M.P. 171"; poisonous; 

 action like Strychnine. 



Soluble in alcohol ; not in water, ether, chloroform, or petroleum ether. 

 [Not precipitated by : 



Platinum chloride. 



lodo-potassic iodide. 



Mercuric chloride.] 



Ammonia. 



Lead acetate neutral. 



,, ,, basic. 

 Tannic acid. 



Concentrated sulphuric acid, dissolves reddish-brown ; not changed by 

 bromine. 



§ l.'jii. NIGELLA sativa, L. ; RainDiriihueir. Investigators: Greenish, 

 ./. 'Cheia. Sur., 1880, and Fhann. ./. Tram. .- Fliickiger, Ja/irh. Pharm., 

 [3], 2, 101. Substance (a); also other alkaloidal and glucosidal sub- 

 stances, but which have not yet been isolated pure. N. Damascena, L. ; 

 the seeds, (/<). 



(«) MELANTHIN G., C.,(,H.,.,0- ; crystalline; M.P. 205°; slightly bitter. 

 Acids change to .]fi>hinlh/ijeinn, CijH.,.jO.,, and sugar. Melanthin and 

 Melanthigenin resemble Parillin and Parigenin respectively. 



Soluble in dilute or in hot alcohol, slightly in chloroform, scarcely in 

 ether, benzene, petroleum ether, carbon bisulphide, or water flatter solu- 

 tion frothy). 

 Reactions : 



Alkaline hydrates, dissolve : acids reprecipitate. 

 Xeutral lead acetate, cloud. 

 Basic lead acetate, white pp. ; soluble in excess. 

 Ferric chloride (to alcoholic solution), yellowish-green. 

 Fehling's solution, not reduced till after hydrolysis. 

 Mercuric chloride, cloud. 

 Colour tests : 



Concentrated sulphuric acid, rose-colour, becoming violet after 15 to 

 20 hours. 

 „ ,, „ with sugar, violet. 



., „ ,, with trace of nitric acid, yellow, changing 



to violet-red on warming. 

 ,, ,, ,, with nitric acid, orange, changing to 



yellow. 

 Swells on boiling with other concentrated acids. 



(i) DAMASCENINE A., C,„H,.,XO„ (A. Schneider,,/. Pharm., [6], 22, 58); 

 crystalline below 27'' C, at which it liquefies; B.P. 168"; alkaline re- 

 action, fluorescent (though not in acid solution), narcotic odour. 

 Soluble easily in alcohol, carbon bisulphide, and chloroform ; also in 



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