Fig. I. White Pine {Finns alhicaulis) of Castle Rock 7,200 feet; Fig. 2. White Pine {Finns albicanlis) Hughe’s creek, Montana, 
probable age 500 years. Stunted growth due to xerophytic condi- Dwarfing of trees due to the altitude 8,200 feet. Timber line 
tions. Grows with Jnniperns commnnis, Fellaea breweri. [Photo- species. Moose grass in the foreground. [Photograph, L. H. 
graph, H. S. Fawcett.] Pammel. ] 
Plate XX VI, 
