CAMERA AND PHOTOGRAPHIC MATERIAL. 49 
The following chemicals will be required, — pro- 
tosulphate of iron, oxalate of potash, and hyposul- 
phite of soda. 
From one to five pounds of each may be pur- 
chased as a stock to start with. Two shallow 
trays for the developing and fixing solutions will 
also be required, and these may be of porcelain 
or of hard rubber; for the quarter-size plates, 
oblong glass dishes may be used, such as can be 
bought at any crockery store for a trifle. Nothing 
is said here of the photographic materials required 
for intensifying, developing by other methods, and 
making silver-prints. 
The ferrous-oxalate developer gives as good re- 
sults in photo-micrography as does any other with 
which the writer is acquainted, and it is desirable 
that the beginner should become thoroughly famil- 
lar with its use before experimenting with other 
developers. 
Intensification is not needed when the negative 
is properly timed ; and if not well timed it is better 
to reject it and make another. 
Silver-prints can be obtained from the nearest 
photographer more economically than the amateur 
can make them himself. It is an advantage, also, 
to the beginner to take his negatives to a practi- 
cal photographer to be printed, as he will receive 
valuable hints as to what constitutes a good print- 
ing negative, and will doubtless find that nega- 
tives with which he was very well satisfied at first, 
hardly come up to the standard. 
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