Figure 3 . - -Phenological observations were 

 made in the ponderosa pine [Pinus pon- 

 derosa) forest type. This picture, taken 

 in 1932 near Greenough, Montana, illus- 

 trates an old-growth ponderosa pine forest 

 with some Douglas-fir understory. 



Figure 4 . --Phenological observations were 

 made at several locations in the exten- 

 sive western larch-Douglas-fir forests 

 of the Northern Rockies. This picture, 

 taken in the Kootenai National Forest 

 area in northwest Montana, illustrates 

 this forest t)pe. 



