226 proceedings of the academy of [1893. 



May 16. 

 The President, General Isaac J. Wistar, in the chair. 



Fifty-four persons present. 



Rev. F. C. Morsell, in connection with the meeting of the 

 Biological and Microscopical Section, made an illustrated com- 

 munication on polarized light under the title "Taking a Sunbeam 

 apart," (No abstract.) 



May 23. 



The President, General Isaac J. Wistar, in the chair. 

 Forty persons present. 



May 30. 



The President, General Isaac J. Wistar, in the chair. 



Twenty-three persons present. 



The deaths were announced of Edward Bancroft, a member, 

 May 22, 1893, and of Dr. Robert Hartmann a Correspondent, 

 April 21, 1893. 



Papers under the following titles were presented for publication : — 



" Descriptions of two new species of North American Bombycidpe" 

 by Herman Strecker. 



" The Measurement of the Radius of Curvature of the Cornea by 

 means of the Helmholz Ophthalmometer," by Henry C. Chapman, 

 M. D. 



Morris L. Orum and Ernest B. Sangree, M. D., were elected 

 members. 



Otto Staudinger of Dresden, Germany and F. Ducane Godman 

 of London, England, were elected Correspondents. 



The following were ordered to be published : — 



