CH. VIII] 



PHO TO-MICROGRA PHY 



215 



Fig. 1S1. 



Fig. 181, Camera and special microscope stand for photographing very large 

 transparent sections. For this the vertical camera is used [Fig. i6g) with the 

 camera reversed on the sliding frame . This frame is elevated sufficiently to utilize 

 the sky as background and illuminanl. The special microscope stand is inclined to 

 the horizontal and placed on the fixed frame supporting the camera ; the specimen 



