INTRODUCTION. 
CHAPTER I. 
APARTMENTS AND GENERAL APPLIANCES. 
A S the aim of this book is to give practical in- 
struction, rather than theoretical or historical 
information, we shall not devote much space to pre¬ 
liminary remarks ; but a few words on the more salient 
advantages of the science with which we have to deal 
may not be out of place. 
Photography may fitly be placed at the head of the 
graphic arts where record, demonstration, or education 
is the object in view ; and photo-micrography is simply 
photography applied to the microscopic image. A 
drawing made by hand with the aid of a camera lucida 
or a “ graphoprism,” however accurately it may be 
executed, cannot carry with it the conviction that is 
carried by a photograph ; while the latter is produced 
with very much less expense of time and trouble, and 
can be reproduced in much greater numbers and at 
very much less cost. Moreover, photography gives us 
the power of showing our graphic production in the 
shape of a lantern slide on a screen to many observers 
B 
