112 



On September 23 the experiment was repeated with similar 

 results. 



On October 13 the experiment was again repeated. This time 

 the plant was kept in the laboratory under a bell-jar, with tubu- 

 lure, and the drop of dissolved mucoid disappeared, hence it was 

 inferred that digestion had occurred at the end of three days. 



Yeast Nucleoprotein 



September 10 particles of yeast nucleoprotein were placed 

 upon a leaf of a plant in the laboratory. The tentacles slowly 

 closed over it and remained closed three days. 



On September 1 1 the experiment was repeated with the dif- 

 ference that the nucleoprotein was moistened with distilled water 

 before it was used. The result was like that of the preceding 

 experiment. The nucleoprotein became dark-colored in each 

 experiment before it disappeared. 



From the response of the tentacles and the disappearance of 

 the nucleoprotein it was inferred that digestion had slowly taken 

 place. 



Tendocollagen 



Fragments of collagen fibers from tendon were placed upon 

 three leaves of one plant. The tentacles bent but did not close 

 tightly. No change in size or appearance of the collagen parti- 

 cles was observed during four days. 



The experiment was repeated September 23, upon a young 

 leaf, with a result similar to the above. 



September 27 and October 13 the experiment was repeated 

 upon mature leaves, the result in each case being a bending of 

 the tentacles within half an hour with no further change, hence 

 the response may be attributed to contact stimulus rather than 

 to digestion. 



Ligament Elastin 



Particles of ligament elastin were placed on a leaf of a plant 

 in the laboratory August 26, at 2:30 p. m. Observations were 

 made at intervals of half an hour during the first four hours, but 

 no response was noted. Daily observations showed no response 



