222 MR. E. SCHUNCK ON THE 



It may further be assumed that 1 equivalent of indican 

 after taking up 4 equivalents of water, is decomposed into 

 1 equivalent of indihumine, 2 equivalents of indiglucine, 1 

 equivalent of propionic acid, and 2 equivalents of carbonic 

 acid, as follows: — 



GjoHg N0 6 1 eq. Indihumine. 

 C 24 H20 Om 2 eqs. Indiglucine. 

 4 eqs. Water H 4 4 ) ~ ) c 6 H 6 4 1 eq. Propionic acid. 



1 eq. Indican C 62 H 31 NCX* \ _ } c 24 U^ 21 2 eqs. Indiglucine. 

 H 4 O J ~ 



C 52 H w NO^ V Q 4 2 eqs. Carbonic acid. 



The formation of indifuscone is quite analogous to that of 

 indihumine, the propionic acid in the preceding equation being 

 simply replaced by acetic acid, for 



/ C22 H 10 NO fi 1 eq. Indifuscone. 

 1 eq. Indican C 62 H 31 NO^ |_|C M H^ 24 2 eqs. Indiglucine. 

 3 eqs. Water H 3 3 j ~~ ) C 4 H 4 4 1 eq. Acetic acid. 



C H NO ^ ^ a ®* ^ e ^ 8, Carbonic acid. 



CWH*N0 r 



The manner in which indifuscine takes its rise from indican 

 needs no explanation, since a comparison of its formula 

 C 24 H10 N0 9 with that of indifuscone shows that its com- 

 position differs from that of the latter by containing in 

 addition the elements of 2 equivalents of carbonic acid. In its 

 conversion into indiretine, indican splits up into 1 equivalent of 

 the latter body, I equivalent of indiglucine, and 4 equivalents 

 of carbonic acid. Here however the anomaly presents itself 

 of a copulated body like indican losing water instead of 

 taking it up during its decomposition into simpler compounds, 

 as will be seen from the following equation : — 



Cgs H 17 NO 10 1 eq. Indiretine. 



1 eq. Indican C M H 31 NO^ = 



C 52 H 31 N0 3 



