96 



BACTERIAL DISEASES OF PLANTS 



from a light room they must be kept locked while development is 

 going on. Often this is very inconvenient to others, but it 

 is the only safe way. 



Our own dark-room (Fig. 61) occupies the northwest corner 

 of a well-lighted large south room which is used for general 

 photographic purposes. It measures, inside, approximately 9 

 feet north and south by 15 feet east and west, and is divided into 



O ELECTRIC BULBS 

 T J -r TAUCETS 



P/yOrOG/?AP/^/C /?OOAf 



D 



CAMERA 

 WINDOW 



D 



CAMERAS 



WINDOW 



Fi«. 61. — Diagram of photographic rooiii, printing room and dark-room used by 

 the writer. 



two parts: (1) an ante-room on the west side, used for making 

 prints; (2) the dark-room proper, used only for the development 

 of negatives. The ante-room is long and narrow with a sink 

 at the northwest corner (behind the corridor door), the re- 

 mainder of the west wall space being occupied by a printing and 

 developing table. The printing is done by means of a battery 

 of large size, fixed tungsten lights, in the southwest corner. The 



