181 



orange-red colour, passing soon into yellow as witli morpMn; be- 

 comes blue with chloride of iron. 



Pseudoveratriii = Helonin. 



PteritaiiniC Acid^Coi H15 Og. In the rhizoma of Aspidium 

 Filix mas. The ethereous solution, obtained in the preparation of 

 tannaspidic acid, leaves on evaporating a black-brown residue, 

 which has to be digested with petroleum as long as the latter 

 assumes a brown colour. Collect the undissolved powder, press, 

 triturate, and boil with water, dissolve the remaining resinous mass 

 in ether and evaporate. — Black-brown, amorphous, shining mass, 

 friable to a drab-coloured electric powder, tasteless, of a faint smell, 

 of acidulous reaction, fuses with a gentle heat, is insoluble in water, 

 dissolves in strong, less in diluted alcohol, readily in ether, not in 

 volatile and in fixed oils; precipitates glue. 



PuCCiu. In the root of Sanguinaria Canadensis, associated with 

 chelerythrin and porphyroxin. Draw out with water and sulphuric 

 acid, precipitate the solution with ammonia, wash the deposit with 

 water, dry, draw out with ether, digest the solution with animal 

 charcoal, filter and add sulphuric acid, which produces a deposit of 

 sulphate of cheleiythrin of a pale-cinnabar colour, insolul)le in 

 ether, like all other salts of this alkaloid. The ethereous solution 

 leaves, after filtering and evaporating, a dark-red, amorphous 

 residue, which has to be redissolved in ether and mixed with 

 diluted sulphuric acid, in order to remove the rest of the chelery- 

 thrin. After filtering and evaporating to dryness, the dark-red 

 mass is treated with alcohol and the Puccin is thrown down from 

 the solution with water. — Appears, after drying, as a red, tasteless 

 powder, insoluble in cold water, fusing to a resin in boiling water. 

 The alcoholic solution becomes pale-yellow with animal charcoal, 

 and leaves a pale-red residue, which turns to a deep-red with 

 hydrochloric acid and forms pinkish needles. 



Pulsatilla camplior^ANEMONiN. 



Plirimrin=Ci8 He Oc. In the madder (from Rubia tinc- 

 torum). Allow the pulverised root to ferment with yeast and 

 water, wash with water, and boil with a sohition of alum. Let 

 cool and add sulphuric acid, which yields reddish flocks of purpu- 

 rin, which have to be freed from alumina by boiling with diluted 

 hydrochloric acid, and are recrystallised in alcohol or in ether. — 

 Forms red needles, anhydrous (crystallising from weak alcohol as 

 orange-yellow needles with 1 equiv. of water) ; fuses by heat and 

 sublimates at 225°, mostly leaving a little coal ; dissolves moi-e 

 readily in water than alizarin with a reddish, in diluted acids with 

 yellow, readily in alkalies with crimson colour, also readily in 

 iilcohol and of a deeper red than alizarin, most readily in ether ; 



