258 Willstätter's Researches on Chlorophyll [Jan. 



ethyl maleinic imide upon oxidation. One nucleus gives upon reduc- 

 tion phyllopyrrole ; this is probably the same one that is lost upon 

 oxidation. The fourth behaves in reduction as it does in the oxida- 

 tion of its carboxyl — it does not form a volatile pyrrole derivative. 

 Upon oxidation it gives the imide of hematinic acid. 



Rocke feller Institute for Medical Research, 

 New York City 



