162 PROCEEDINGS OF THE ACADEMY OF [1881. 



that external circumstances had no influence ; but that the con- 

 dition of the living material on which they acted, decided the final 

 character, and that Mr. Redfield's question was in the right line. 



July 12. 

 The President, Dr. Ruschenberger, in the chair. 

 Ten persons present. 



The death of John P. Brock and of Alfred D. Jessup, members, 

 was announced. 



The following was ordered to be printed : — 



