52 
PRACTICAL PHOTO-MICROGRAPHY. 
with a half-inch micro objective, but the apparatus 
is confessedly not intended for such work, which can 
be equally well done, and with more convenience, with 
the usual photo-micro instrument. Many photo¬ 
graphers would find such an apparatus as here 
described an extremely interesting instrument, for the 
variety of objects that are amenable to such treatment 
is great. 
In the domain of insect photography there is great 
scope, and when we come to insects as they usually 
appear in “ preparations ” a good deal of skill will be 
required. The usual dense yellow body with or with¬ 
out almost colourless legs and other “ appendages,” 
will require special treatment, and the best hint we can 
give for such subjects is to use “ Spectrum ” plates of 
Messrs. Cadett and Neall with heavily coloured “light- 
filters.” Large sections such as are produced by path¬ 
ologists and others must be treated according to their 
staining, which is sometimes—especially in the best 
preparations—very puzzling. 
The work of Dr. Spitta in the above direction is 
worthy of being consulted by those who desire to go 
thoroughly into this matter. 
As illuminant we find an acetylene double burner, 
fitted with a suitable reflector, acts admirably with this 
instrument. It is easy to get even illumination, and 
exposures are very short even with strong yellow light- 
filters—such will probably be found advantageous with 
most specimens. We use the “ Dreadnought ” acety¬ 
lene generator of Tylar, Birmingham. 
