1907.1 NATURAL SCIENCES OP PHILADELPHIA. 149 



April 2. 

 Arthur Erwin Brown, D.Sc, Vice-President, in the Chair. 

 Twenty-seven persons present. 



John W. Harshberger, Ph.D., made a communication on the sci- 

 sntific appUcation of ecology in the wet and dry cultivation of plants. 

 (No abstract.) 



April 16. 



Arthur Erwin Brown, D.Sc, Vice-President, in the Chair. 



Twenty-three persons present. 



Henry Skinner, M.D., spoke of the variations in the life-history 

 of insects. (No abstract.) 



Richard H. Harte, M.D., was elected a member. 



The following were ordered to be printed : 



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