Ill 



Edestin 



Particles of crystalline edestin were placed on each leaf of a 

 single plant on October 13, 1907. The response of the plant 

 was very slow, and at the end of 24 hours the edestin granules 

 showed no apparent change. Gradually, however, they were 

 dissolved and at the end of three days had disappeared. 



Fibrin 



Small shreds of fibrin * were placed upon a leaf August 26, 

 1907, at 2:30 p. M., the plant being kept in the laboratory under 

 a bell-jar, with tubulure, for observation. At the end of 4 hours 

 the tentacles had curved inward and, after 19 hours had elapsed, 

 the particles had been carried from the margin to the center of 

 the disc. At the end of 67 hours a part of the fibrin remained, 

 with the tentacles still slightly closed over it. ■ 



On August 26, 1 907, small shreds of fibrin were placed on 

 one leaf of each of three plants, which were left at the propagat- 

 ing house ; 24 hours later the tentacles were tightly closed over 

 the fibrin in each case. They remained closed through the 

 second day, when they expanded fully. The fibrin had been 

 partially dissolved. Some of the tentacles on two of these 

 leaves were closed over insects. Fibrin was then placed upon 

 the other tentacles, and these continued to be closed after those 

 which digested the fibrin had expanded again. 



In an experiment begun October 13, 1907, shreds of fibrin 

 were placed on all the leaves of one plant ; 24 hours later the 

 response was slight but at the end of 3 days the fibrin had dis- 

 solved. 



The results of these experiments show that fibrin, as pure as 

 it can be prepared by the best methods, is dissolved and digested 

 when placed upon leaves of Drosera rotundifolia. 



Tendomucoid 

 Small particles of tendomucoid were placed upon two leaves 

 of the same plant, September 18, 1907, and soon dissolved, the 

 glistening drop of solution remaining some time upon the leaf. 



* Given special care in purification. Asli content was only 0.4 per cent. 



