Vol. Ill, No. 4 ■f"'"' '9°* 



PROCEEDINGS 



OF THE 



DELAWARE COUNTY 

 INSTITUTE OF SCIENCE 



Publication Committee : 



T. Chalkley Palmer, Chairman; Henry L. Broomall, 



Trimble Pratt, M. D. 



Carolus M. Broomall, Editor. 



Media, Pa. 



Issued Quarterly. Subscription, One Dollar per annum in advance. 

 Address all correspondence to the Editor. 



