86 PHOTO-MICROGRAPHS. 
mended by a practical photographer may be 
used. 
A suflicient quantity of the varnish is poured 
upon the plate, held by one corner in a horizontal 
direction, and this is caused to flow over the 
whole surface in a uniform manner by tipping the 
plate. The surplus varnish is allowed to flow 
back into the bottle from one corner of the plate. 
The varnish dries quickly, and the plate should 
be placed upright until it has hardened. 
Every negative preserved should be numbered by 
scratching the number through the film in one 
corner, or by means of a small paper label 
attached by mucilage. 
The number of each negative, the date upon 
which it was made, the amplification, the objective 
used, and the nature of the object photographed, 
together with remarks which may prove useful 
in future operations, with reference to time of 
exposure, staining agent used, etc., should be 
recorded in a book kept for this purpose. The 
negatives may be conveniently stored in the paste- 
board boxes in which the dry-plates are received ; 
the numbers of the negatives in each box being 
written upon a slip of paper attached to the front 
of the cover, for convenience in finding a particu- 
lar negative when a series of boxes are piled one 
upon the other. 
