PRACTICAL DIRECTIONS 



Fon 



COLLECTING, PRESERVING}, TRANSPORTING, 



PREPARING AND MOUNTING 



DIATOMS 



BY 



PEOF. A. MEAD EDWARDS, M. D. 

 PROF. CHRISTOPHER JOHNSTON, M. D. 

 PROF. HAMILTON L. SMITH, LL. D. 



NEW YORK : 

 THE INDUSTRIAL PUBLIC AT ION COMPANY. 



1877. 



