1 2 THE A B C OF PHOTO - MICROGRAPHY 



moved and the wide body being carefully 

 blackened on the inside is ready at once for 

 use in this manner. Other makers might well 

 adopt the simple plan of blackening the in- 

 side of the tubes, but do not, as a rule, seem 

 to have thought of it. The aplanatic eye- 

 pieces are particularly well adapted to photo- 

 graphic work, being fully equal to the projec- 

 tion oculars of Zeiss for the same purpose. 

 A mechanical stage having very smooth rec- 

 tangular motions may be adapted in a moment, 

 or removed as readily. The objectives are 

 remarkably good, indeed the iV oil immersion 

 is the best lens for photographing bacteria 

 in tissues that I have ever used. The lower 

 powers are equally excellent. The frontispiece 

 and Figures 7 and 20 were made with them. 

 Larger and more elaborate microscope 

 stands are, of course, to be had from all 

 these makers (some of them specially designed 

 for photo-micrography) up to the most per- 

 fect and costly instrument by Zeiss for that 

 purpose, but it is not within the scope of this 

 elementary book to do more than mention 

 them. I may say, however, that aside from 

 their greater and special conveniences no bet- 

 ter work can be obtained with them from any 

 given objective than is possible with the more 



