PHOTO-MICROGRAPHIC APPARATUS. 



209 



as when looking down the tubes of his microscope, and the 

 author has but few doubts whether, after all, despite adverse 

 criticisms, this is not the simplest and cheapest plan. He 



FIG. 192. 



has both taken, and seen taken, photo-micrographs of the 

 same subjects, with and without the use of eye-pieces, and 

 could not discover any difference between them. 



FIG. 193. 



There is more light lost when working with the eye-pieces 

 attached, but in these days of extra-sensitive plates this is 

 certainly no disadvantage with the lower and medium 

 powers. 



The microscope employed may be of any ordinary kind, 

 monocular preferably, and if provided with a means of 

 shortening the tube or body so much the better. The 

 tube should be lined with velvet, to prevent central flare, 



P 



