PREFACE. 
In this little volume the Author has attempted 
to give such an account of the technique of Photo- 
micrography as will enable persons familiar with 
the use of the microscope to make photo-micro- 
graphs of suitable objects with a minimum expen- 
diture of time and money. The Illustrations have 
been selected with a view to showing the kinds of 
microscopic objects best suited for photographing, 
and the results which may be expected by one who 
is willing to devote a little time to the mastering 
of technical difficulties. 
The work is intended for beginners, and not 
for those who, having made some progress, are 
ambitious to undertake the more difficult feats in 
photo-micrography, — such as the photographing 
of difficult test-diatoms by oblique light. The 
Author has himself found no time for work of this 
kind, but has resorted to photography chiefly for 
the purpose of making pictorial memoranda of his 
microscopical observations. His scrap-albums are 
