SELECTION, ETC., OF OBJECTS FOR PHOTOGRAPHING. 91 
The writer has thus been able to obtain nega- 
tives from silver prints made years ago, which 
were excellent, with the exception that the tex- 
ture of the paper shows to some extent. It may 
be that the result would be better still if the paper 
upon which the silver print is, should be made 
transparent with oil or varnish. 
Another hint, which may be useful to those 
who use a lantern for the illustration of popular or 
scientific lectures, has reference to the possibility 
of making outline drawings with a sharp-pointed 
instrument upon the gelatine coating of a dry- 
plate. The lines of the negative drawing must 
be clean-cut, and entirely through the film. The 
negative may be used in the lantern directly, or 
a positive may be printed from it on another plate 
by the method already described. 
Those who desire to make their own silver 
prints are referred to manuals of photography for 
details as to the method of doing so. As already 
stated, the amateur photographer is advised to 
place his negatives in the hands of the nearest 
practical photographer, when he desires a small 
number of silver prints from them. 
XIV. SELECTION AND PREPARATION OF 
OBJECTS FOR PHOTOGRAPHING. 
Success in making photo-micrographs depends 
quite as much upon the selection of suitable ob- 
jects and upon their proper preparation with 
