PROCEEDINGS 



OF THE 



Delaware County Institute of Science 



Carolus M. Broomall, Editor. 



Publication Committee : 



T. Chalkley Palmer, Chairman; Trimble Pratt, M. D., 



J. C. Starbuck, M. D., B. M. Underbill, V. M. D., 



M. H. Hoj't, Edward V. Streeper, Jr. 



Volume VII 



Media, Pa. 



