

BY 

 CHARLES S. BOYER, A.M., F.R.M.S. 



ILLUSTRATED WITH SEVEN HUN- 

 DRED DRAWINGS BY THE AUTHOR 



PRESS OF 



J. B. LIPPINCOTT COMPANY 



EAST WASHINGTON SQUARE 



PHILADELPHIA 



1916 



.:... . 



THE DIATOMACE.E OF 

 PHILADELPHIA AND VICINITY 



