CHAPTER III. 
PHOTO-MICROGRAPHIC APPARATUS, 
(i.) HORIZONTAL. (2.) VERTICAL. 
O UR complete apparatus consists essentially of a 
camera, a microscope, and appliances for illu¬ 
mination. Though not absolutely essential, it is highly 
important that all these parts should be fixed to one 
base. We view with distrust any apparatus where, for 
instance, the camera, is supported by one table or 
stand, and the microscope or source of light by another; 
any such arrangement savours of unsteadiness, and if 
there is tremor, the parts will probably not vibrate 
synchronously. We have seen fairly good work, at 
moderate magnification, done with an “ apparatus ” put 
together somewhat after the fashion here shown; but 
anyone proposing to occupy himself with even low 
