346 University of California Publications in Zoology [Vol. 12 



more open places and meadows the birds were about as plentiful 

 as at other camps. This locality is in the Canadian zone. 



Our aneroid registered 7900 feet at the top of Thompson Peak, 

 which is a pointed mass of rock dropping off steeply on all sides 

 and surmounted by a government monument. Except for the last 

 hundred feet or so up this point, the ascent of the mountain w;ts 

 not difficult, mainly over great stretches of granite rock and snow 

 slides until we reached a granite ridge which forms the main 

 approach to the peak. About half way up we obtained a good view 

 of the lake which is the source of Grizzly Creek. There was ice still 

 in it and we were told that the snow bank between the two peaks, 

 from which it is fed, never entirely melts. On the eastern slope 

 of the ridge were wind-blown specimens of white-bark and foxtail 

 pines forming a heavy growth, while on the western slope tongues 

 of hemlock ran up the mountain sides. 



The view from the summit well repaid us for the climb. On the 

 east was Mount Shasta; directly below us to the south, two small 

 lakes which constitute the source of the Stewart Fork of the 

 Trinity River. Rattlesnake Creek also heads off to the south, sep- 

 arated from Stewart Fork by a jagged crest of rocks. The water- 

 shed of the Rattlesnake is fan-shaped, the granite smooth as if 

 planed by glaciers, but covered with a scattering growth of pines 

 and hemlocks. To the south and west we saw the Trinity Moun- 

 tains and the Coast range ; in fact, as far as the eye could reach, 

 there were mountains. We were told that Mount Hood can be seen 

 from here on a clear day, but this sounds like an exaggeration. 

 We collected specimens of red and white heather and other plants 

 of the Hudsonian zone. 



We put in four days collecting on Grizzly Creek and then 

 returned to Summerville. Another night, that of July 25, at Hinz's 

 ranch and we were off up Rush Creek to its head, where we camped 

 in a large meadow. 



Rush Creek heads in broad, open meadows with occasional strips 

 of alders (see pi. 17, fig. 6). Patches of red fir skirt the outer 

 edges of the meadows and extend up to the divide, which rises on 

 either side of the lowest point of the saddle. Our camp was at an 

 altitude of 6400 feet, with the divide some thousand feet higher. 

 The outlook to the south and west was quite comprehensive and 

 we could see directly across to the two Thompson Peaks with the 

 snow bank between. A side canon to the south of our camp con- 



