V^I 











Fig. 3t'>. A 'lide-rock slope, soutlu-rn exposure, bearing Pinus pon- 

 derosa iiiul DoufLlas spruce. Heavier fore'^t to right Abies Insiocarpa, 

 spruce and lodgepolc pine. Xear bend of Bitter" Root \'allev, about 

 6000 feet, August. 



151 



