FOREST DISEASE SURVEYS. 5 



The topographer,, while sketching in the type lines and indicating 

 the age class divisions, can at the same time indicate the boundaries 



Fig. 4. — Typical rot of the Indian-paint fungus on Abies grandis. Note the spines on 

 the fruiting body of the fungus. (Photographed by G. G. Hedgcock.) 



of the heavier disease infections and also. pencil in the cull percent- 

 ages. In this way a pathological map 1 can be secured for the area 



1 Weir, J. R. Some suggestions on the control of mistletoe in the National Forests of 

 the Northwest. In Forestry Quart., v. 14, no. 4, p. 567-577. 1916. 



