ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



481 



case a photographic objective is placed behind the prisms. The adjustment 

 for focus is made by moving the stage. These forms are specially suitable 

 for opaque objects. 



In Nachefs photomicrographic camera (figs. 132 and 133), M. A. Nachet 

 has provided for its use either in a vertical, inclined, or horizontal position. 

 This is accomplished by attaching it to two upright supports which can be 



Fig. 132. 



Fig. 133. 



inclined on two short pillars fixed to the wooden base on which the Micro- 

 scope is placed. The camera is also arranged to slide on the supports so 

 that it can be raised or lowered, and set at different heights. Adapter- 

 tubes of special construction are applied to the body-tube to connect it with 

 the camera, which are so arranged that the focal adjustments of the Micro- 

 scope are made independent of the adjustment of the camera, and at the 

 same time no extraneous light is allowed to enter at the connection. 



III. Cameras for Horizontal Microscopes. — Of these there are an endless 

 number : — Moitessier's * (fig. 134) makes use of an ordinary Microscope. 



Op. cit., p. 134. 



