114 



In Darwin's experiments with meat, creatin (and presumably 

 the other nitrogenous extractives of meat) had seemingly no in- 

 fluence. 



General Conclusions 



The results of these experiments indicate the ready digestibility 

 of dry egg-white, fibrin, tendomucoid, and nucleoprotein. Acid- 

 albumin, alkali albuminate, and edestin were digested, but some- 

 what less readily than the products first named. Collagen and 

 elastin appeared to be entirely indigestible. Even when moistened 

 with meat extract the elastin particles failed to undergo digestive 

 alteration. Creatin did not cause bending of the tentacles. 



These observations cannot be directly compared with Darwin's 

 because Darwin dealt with mixtures or crude products. 



The proteolytic enzymes of Drosera are, like those of other 

 organisms, able to digest some proteins and unable to digest 

 others. 



New York Botanical Garden 



