ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 



741 



and placing it horizontally, sufficient room is obtained to fix the camera to 

 the column S in an inverted position, i.e. with the dark slide upwards. 



^^U 



Fig. 125. 



In this position the camera is available for the photography of opaque 

 objects placed upon the drawing board Z. The entire apparatus may be 



3 C 2 



