48 PHOTO-MICROGRAPHS. 
Ill. CAMERA AND PHOTOGRAPHIC MATERIAL. 
One of the small cameras furnished with the 
cheap photographic outfits for amateurs now in the 
market, may be used by beginners, or by those 
who propose to devote only an occasional spare 
hour to this kind of work. But it will be better 
for one who really intends to succeed, and to make 
a practical use of photography in connection with 
his microscopic studies, to purchase a well-made 
camera, the plate-holder of which will take plates 
of the following standard sizes, — 64 X 84 inches; 
41 x 52; 34 X 42; 28 x 81h 
The beginner is advised to use only the small- 
est plates, or the quarter-size (3} X 44), until 
he is sufficiently expert to be sure that he will 
get a first-class negative, at least occasionally. 
Unless he has the advantage of receiving a 
few lessons from a practical photographer, or has 
better fortune than the writer anticipates, there 
will be a considerable expenditure of dry plates 
before photo-micrographs will be produced which 
he is ready to pronounce quite satisfactory. The 
above hint is therefore given on the score of 
economy. 
It will be safe to order a gross of quarter-size 
plates to start with, together with the necessary 
chemicals for developing and fixing. Fortunately, 
these are inexpensive, and not difficult to manipu- 
late. 
