I9I3] 



Jacob Rosenhloom 



237 



chorion were free from amylase, sucrase, maltase, lactase, lipase. 

 peptidase, ereptase, acid-protease and alkali-protease. 



Table showing results of ensyme tests in glycerol and aqueous extracts of a 



human chorion 



It would seem, from the results of this study, either that the 

 enzymes of the placenta are formed at a comparatively late period 

 or that the decidua serotina furnishes the enzymes which subse- 

 quently appear in the placenta. Possibly the presence of blood in 

 the placenta accounts for the occurrence of certain enzymes that 

 have been detected in the placenta. 



° Extract rendered acid with 0.2 per cent. hydrochloric acid Solution. 

 * Extract rendered alkaline with 0.5 per cent. sodium carbonate Solution. 



