V \liu£. 



A SKETCH 





"(.17./ 



NATURAL HISTORY 



<-** 





OF THE 



DIATOMACE^E. 



BY A. MEAD EDWARDS, M. D., 



MICROSCOPIST TO THE GEOLOGICAL SURVEY OF NEW HAMPSHIRE. 



IS' 01 



, 



CONCORD, N. H. : 

 EDWARD A. JENKS, STATE PRINTER. 



1874. 



■ . ! 



1 " ' ■"■' ■ ■' ■- ■ ■ - I..,., - 



