1892.] NEW YOKK ACADEMY OF SCIENCES. 17 



active owinfy to injuries received diu-ing- the operation of secur- 

 in<:^' artificial entrapment. 



In conclusion, the observations upon Dionaea suggest in 

 summai'y the following noteworthy characters : — 



I. Specialization for the cajiture of ground insects. 



II. The marked differences in irritability in individual leaves; 

 the usual inability of the plant to capture and retain larger and 

 more active insects ; the usual failure of the plant to capture 

 transient insects ; the relocated closings of the trap upon inor- 

 ganic and vegetable objects. 



III. The sensitiveness of the trap in parts other than the 

 filiaments. 



IV. The marked vegetable element of the entrapped organ- 

 isms, suggesting homologies in function with Piuguicula, 

 Drosera and Utricularia, a relation moie probable when we take 

 into consideration the presence of quadrilid processes and their 

 occui'rence upon the underside of the trap. 



Columbia College, Oct. 16, 1892. 

 "Note on a species of Hieracium," by N. L. Britton. 



» 



"Artificial production of Twins and Multiple Embryos in Am- 

 phioxus," by E. B. Wilson. 



The Fourth paper. The Cretacious Mammalia in the Ameri- 

 can Museum of Natural History; to have been presented by 

 Professor Osborn, was deferred until the following-, meeting of 

 the Section. 



Professor Britton exhibited an Indian net-sinker about ten 

 inches in length that he had found on Manhattan Island. • The 

 finding of similar relics during the excavations for the new ship 

 canal was noted. These had been found associated with the 

 plates of the Sturgeon. 



The meeting adjourned. 



