1039 
of phyllogene under these conditions does not give off any colour. 
Even a 20°/ 0 acid remains nearly colourless, but a 28% acid gets 
coloured very strongly. Another interesting and important question: 
whether phyllogene does not contain phylloxanthin in the free state, 
could also be solved with comparative certainty. Phylloxanthine 
dissolves somewhat in 20% acid, easier in 24% acid, whereas an 
■ethereal solution of phyllogene gives off scarcely any colour to 
a 24% acid. We have found that phylloxanthine is able to form 
metallic salts in exactly the same manner as phyllocyanine although 
in some cases the reaction is rather slow. It has been found for 
instance that phylloxanthine reacts with zinc hydroxide in the pre¬ 
sence of carbon dioxide yielding a compound similar to that de¬ 
scribed by Schunck in the case of phyllocyanine and which may 
be compared with the interesting substances obtained by Siegfried 
by acting on amino acids with baryum hydroxide and carbon dioxide. 
Cone, hydrochloric acid acting on phylogene produces besides 
a large amount of decomposition products, which cannot be puri¬ 
fied, phyllocyanine and phylloxanthine. In order to decide the ques¬ 
tion whether under such conditions several phvllocyanines are 
formed, we have poured the hydrochloric acid solution into a large 
•excess of water, extracted with ether, filtered the ethereal solution 
and treated the latter successively with 5, 10, 15, 20 and 27.7% 
hydrochloric acid. The two weaker acids did practically extract 
no colouring matter, the third extracted the chief amount of phyllo- 
-cyanine present,whereas the 20% acid extracted a mixture of phyllo¬ 
xanthine and perhaps some unaltered phyllogene. The ether left 
after extracting it with 20% acid contained chiefly phylloxanthine 
which could be extracted with 28.7% hydrochloric acid. The isola¬ 
tion of the respective colouring matter was carried out in the us¬ 
ual way, viz. after diluting the acid solutions with water by 
extraction with ether, evaporating the latter and crystallising the 
free colouring matter from a suitable solvent. The colouring matters 
taken up by the 20% acid, were treated again with cone, hydro¬ 
chloric acid, and in this manner a further quantity of phyllocya¬ 
nine and phylloxanthine were obtained. 
Next to the phyllocyanine described by E. Schunck it was im¬ 
possible to isolate another colouring matter of similar properties. 
1 * 
