47 



means of sulpliuret of hydrogen, leave to ciystallise in the cold, 

 and recrystallise the Ch. in alcohol. — It forms large, white, leaf 

 like crystals of raother-of-pearl lustr-e, without smell or taste, 

 lighter than water, loses the water when heated, fuses afterwards 

 (at 137°) and distils by careful heating undecomposed. In higher 

 temperatures it separates into various volatile products. It does 

 not dissolve in water, little in cold alcohol and oil of turpentine, 

 readily in hot alcohol, oils and ether; is not affected by caustic 

 alkalies. 



Clirysophauic Acid = C20 Hg Oq (called also according to its 

 ■origin Lapathin, Parietin or Parietic acid, Parmel-yellow, Rha- 

 ponticin, Pheic acid, Pumicin). In the roots of the genus Rheum 

 and Rumex, in Parmelia parietina and Squamaria elegans, and 

 probably many other Lichenes. Digest the Parmelia parietina or 

 the root of rhubarb with weak alcohol, containing caustic potash, 

 give to the strained liquid access of carbonic acid gas, dissolve the 

 deposit in alcohol of 50% mixed with a little caustic potash, filter 

 and pi-ecipitate with acetic acid. Dissolve the precipitate, after 

 filtering, in boiling alcohol, filter hot and add water, whereby 

 yellow flocks of Chr. are separated, which have to be purified by 

 recrystallisation in alcohol. — Delicate orange-yellow, felted needles, 

 similar to iodide of lead, of gold-lustre, almost without taste, fusing 

 at 162°; sublimate partly unaltered by careful heating; scarcely 

 soluble in cold, a little more in boiling water with bright yellow 

 ■colour, in 1125 parts alcohol of 85% at + 30°, in 224 parts boiling 

 alcohol, in ether, glacial acetic acid, amylalcohol, remarkably well 

 in benzol and oil of coal-tar, in concentrated suljihuric acid with 

 beautiful red colour and precipitable without alteration by water 

 with yellow colour, readily soluble in alkalies with red colour, 



Chrysopicrin = Vulpulin. 



Clirysorhamnin = C46 H22 022- According to Kane in the 

 unripe so-called Yellow Perries (Grains of Avignon, from 

 Rhamnus tinctorius, R. infectorius, R. saxatilis, R. amygdalinus, 

 P. oleoides); yet Gellatly did not succeed in obtaining it either 

 from the ripe or the unripe berries. Obtained by extracting with 

 ether, it i-epresents beautiful gold-coloured, silky, concentrically 

 united needles, dissolves scarcely in cold water, readily in alcohol 

 and in ether; by boiling with water, xanthoi-hamnin is produced; 

 it is not altered by acids and dissolves, apparently under decompo- 

 sition, in alkalies. 



Cicittill. Volatile alkaloid, occurring in all parts of Cicuta 

 virosa, but as yet only obtained in the aqueous solution, and is 

 very imperfectly investigated. 



[Cicuteil=C2o Hiß. A hydrocarbon contained in the volatile 

 oil of the root of Water-hemlock or Cowbane (Cicuta vLrosa). It 



