PUBLISHERS' NOTICE. 



HE following pages are presented to the practical micro- 



scopist as one of the best collections of useful information 

 on photo-micrography that has appeared for many years. The 

 author's standing amongst English scientific workers is a sufficient 

 guarantee for the thoroughness of the methods and processes 

 described, and we feel that American laborers in the same field 

 will find them an invaluable aid in this interesting department 

 of applied photography. 



