ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
237 
by a telescope on the plate of a camera, “ as ” (he says) “ I venture to 
designate as illusory any other mode of focusing.” Such an arrange- 
ment is new to us. In the “ Universal 
Camera ” the Microscope M is connected 
with the apparatus, as shown in fig. 22, 
and the following arrangement is adopted 
for viewing the different parts of the 
picture on the plate. To the plate-holder 
are attached two pillars C C', which carry 
an arm ah c c (fig, 23) secured in position 
by two milled heads s s. This arm sup- 
ports the holder d e for the Microscope, 
d e slides on c c and can be clamped in 
any required position. At b the arm has 
an arc-shaped slit whose centre is at a. 
The movement of the Microscope along 
the arm c c, combined with the rotation 
about the centre a, enables the observer to 
cover the whole field of view. In order 
to bring the focal planes of Microscope 
and telescope into coincidence, a limited 
fine motion is communicated to the eye- 
piece O of the Microscope by means of 
the screw s" (fig. 23). 
In the small camera for small tele- 
