62 



washed and decomposed with sulphuret of hydrogen and the solu- 

 tion containing impure chloride of C. purified by repeatedly 

 precipitating with chloi'ide of mercury. — It crystallises in 

 colourless, quadrangular prisms of lasting bitter taste, becomes 

 moist at the air, dissolves in water and alcohol in every propor- 

 tion, less readily in chloroform and amylalcohol ; not soluble in 

 a,nhydrous ether, benzol, oil of turpentine and sulphide of carbon ; 

 has a slightly alkaline reaction, saturates the acids completely and 

 yields crystallisable salts; assumes with concentrated sulphuric 

 acid a beautiful blue, with Chromate of potash and sulphuric acid 

 (like strychnin) a violet and with concentrated nitric acid a purple- 

 red colour. 



Curcillllill. The yellow resinous pigment of Curcuma longa. 

 Tx'eat the root, exhausted by water, with alcohol, evaporate to 

 dryness, treat with ether, which leaves a brown extractive sub- 

 stance, and evaporate the ethereous solution. — Red-brown, of a 

 beautiful yellow colour when finely divided or dissolved, of aci'id, 

 l^epper-like taste, fuses above 50°, dissolves little in boiling water, 

 readily in alcohol, ether and oils, becomes brown-red by alkalies, 

 yellow-red by boric acid, carmine-red by diluted sulphuric acid. 



Cuscoiiiii=ARiciN. 

 Cusparin = Angusturin. 

 Cyaniii=ANTHocYAN. 



Cyclaillill=C2s Hie 012. The poisonous ingredient of the 

 tubers of Cyclamen Europteum ; also, but in less quantity, in the 

 roots of Primula veris, Anagallis arvensis, Limosella aquatica, 

 and doubtless in many other Primulaceai, Scropliularinse and 

 allied plants. Treat the bruised root with cold water, evaporate 

 the liquid to honey-consistence, exhaust with alcohol and allow to 

 evaporate. — Forms small, white crystals or white, amorphous, 

 lustreless, friable mass, becomes brown in the light, swells up in 

 damp air, has a very acrid, rancid taste and neutral reaction; is 

 not volatile; dissolves in 500 parts water, becomes transparent in 

 contact with cold water, afterwards viscid and dissolves readily ; 

 the solution yields a froth like soap-water, becomes cloudy at 60° 

 to 70° from the separation of coagulated C. and resumes its clear- 

 ness when cold and kept for several days; dissolves in alcohol, 

 wood spirit, acetic acid and glycerin, not in sulphide of carbon, 

 chloroform, ether and oils, is completely jjrecipitated by tannic 

 acid, but not by metallic salts; dissolves in alkalies, in diluted 

 acids more readily than in water ; is decomposed by synaptase and 

 yields sugar. 



Cylicodaplllie Fat, obtained from the fruit of Tetranthera 

 calophylla. Fuses at 45°, contains 14°/^ olein and 85°/^ lauro- 

 stearin. 



