also diehroizm; in reflected light thin layers appear greenish. Hy- 
drochlorie acid added to the above solutions causes an identical 
change in both cases. The colour turns bluish violet and the solu- 
tions, if sufficiently diluted cause four bands in positions which 
differ considerably from those oceupied by the original bands. In 
the orange there are now two narrow faint bands, past the D line 
a broad dark band and finally in the green a badly defined faint 
band. The wave lengths corresponding to these bands I have 
given before !). 
The chloroformie solutions of phylloerythrine and bilipurpurin 
show also exactly the same spectrum. The band in the orange is in 
this case more pronounced than in the acetie acid solution. Loebiseh 
and Fischler *) did not mention it; they examined evidently com- 
paratively dilute solutions. Bilipurpurin, like phylloerythrine, enters 
into reactions with zinc acetate and ceuprie acetate; the salts formed 
cause identical absorptions. Alcoholie potash dissolves both sub- 
stances easily. yielding brownish-red-violet solutions. 
The final proof of the identity of phylloerythrine and bilipur- 
purin is given by the examination of the absorption bands in the 
ultraviolet part of the speetrum. Phylloerythrine causes, as I have 
shown ?), two very charaeteristie bands. a darker one in front of 
the ke- line and a faint one just past this line. Bilipurpurin behaves 
in exaetly the same manner. Photographs taken on the same plate 
of both eolouring matters dissolved in ehloroform or in acetie acid 
show that the bands are in absolutely identical positions. 
As regards the identity of bilipurpurin and cholehaematin there 
cannot be any doubt. Loebisch and Fischler were not acquainted 
with the papers of Mac Munn and Gamgee on cholehaematin and 
this was the cause of introduetion of a new name for an already 
known substance. The great merit of Loebisch’s researches is how- 
ever by no means impared by this faet. 
We have therefore at present three different names for the same 
substance; which of them will be suffered to survive depends upon 
further researches. These must definitely settle the origin of the 
colouring matter with absorption bands, met with in biles of her- 
1) This Bulletin 1903, 641. 
Salze: 
*) This Bulletin 1903 plate XVI, 1904 plate VI. 
