HOW TO PHOTOGRAPH MICROSCOPIC OBJECTS. 
65 
The flatness of the object is no less important than the 
colour. Every part should lie as nearly as possible in one plane. 
Among vegetable tissues, cells, hairs, ducts, and sections of 
wood, may be mentioned as good objects. Several of the Algae, 
including Diatomaceae and Desmidese, may be photographed 
entire. Specimens from the higher animals would include 
blood-discs, sections of bone and teeth, epidermal structures, 
muscular, nervous, and fibrous tissues; whilst among lower 
organisms, Infusoria, Zoophytes, Sponges and Insects, either en- 
tire or in parts, will be found to supply an infinite variety of 
slides adapted to the purposes of photomicrography. Much 
trouble will be saved in alteration of screw collar by mounting 
the Diatomaceae dry on a thin glass cover. A number of these 
squares may be kept in a small box made for the purpose, and 
there will be no difficulty in mounting them when required on 
a perforated glass or zinc slide by means of a small indiarubber 
band. 
In the foregoing pages, I have endeavoured briefly, and as 
clearly as the subject will admit, to describe one of the modes 
by which faithful transcripts of various microscopic objects can 
be obtained on paper. Of sunlight pictures I have said nothing, 
but anyone who wishes information on the subject will find it 
ably treated in an article contained in Dr. Beale’s “ How to 
work with the Microscope.” It has been my desire to place the 
art of photomicrography before my readers in the light of an 
amusement and solace for evening hours, rather than as a study 
demanding the labour and light of the day ; and I am not with- 
out hope that some may be induced in their intervals of leisure 
to take up an art at once so interesting and promising in its 
results. 
