716 
Journal o f Agricultural Research 
Vol. XXX, No. 8 
• Yellow pine (113 fires) 
X Pinon-Juniper (46fires) 
* Brush (5 fires) 
I Alpine (30fires) 
•0 Douglas fir (50fires) 
Fig. 17— Southern Arizona and New Mexico (Region 20): 
Relation of size of fire to time elapsed between discovery 
and attack 
Note. —Data from Region 18 also used for Douglas fir and 
alpine, and data from Region 19 for Douglas fir. 
