DEVELOPMENT OF THE PLATE. 
I 21 
is faintly seen in all parts, we may complete develop¬ 
ment by the addition of alkali quant, suff. The fingers 
should not be immersed in this developer more than 
necessary. It is apt to produce a skin disease with 
some persons. 
The Imogen Sulphite Developer. 
This developer (Zimmermann) has lately attracted 
our favourable attention on account of its simplicity, 
and the fine “crisp” black and white nature of the 
image produced by it. It is also very amenable to the 
restraining action of potassium bromide. The formula 
is as follows : 
A. Imogen sulphite ... ... ... i part. 
Water ... ... ... ... ... 12 parts. 
B. Washing soda, a “ saturated solution ” in water 
Developer—A. 2 parts. 
B. 1 part. 
Half a grain of pot. bromide for each ounce of developer if desired. 
Very great density, with clear shadows, can be 
obtained with this developer; in this respect it comes 
nearer to our hydrokinone formula than any developer 
known to us. 
The manipulations of development are simple. The 
plate is removed from the dark slide, and it is useful 
now to write on the him, with a pencil, any details 
which may be required as memoranda; the magnifica¬ 
tion, the number or name of the preparation, etc. The 
greatest care must be taken that the light is “ safe,” 
and the dish in which the development is carried on 
should be kept covered as much as possible during the 
operation. But when once the image has come well 
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