214 Univt rsity of California Publications in Zoology [Vol. 10 



To the northwest rises San Jacinto Peak. 10.805 feet, the 

 highest point in the range. Ascending the mountain, limber 

 pine extends, though in dwarfed or prostrate form, clear to 

 the summit, where we saw also a very little chinquapin, Ribes, 

 and a few tufts of J uncus and grass growing in the crevices be- 

 tween the granite slabs. Otherwise the summit is a mass of huge, 

 loosely piled boulders, with occasional patches of bare gravel. 

 For a careful analysis of the flora of Sao Jacinto Peak see 

 Hall (1902). 



The abruptness of the eastern slope of the peak renders 

 ascent from that side so difficult that we did not attempt to work 

 the middle altitudes. The tremendous declivities to the desert 

 below are so nearly vertical that, from the summit, we beheld 

 the various desert stations previously explored spread out below 

 us as on a gigantic relief map. 



A consideration of the animal life did not enable us to 

 distinguish the presence of any zone above Canadian. The area 

 of sufficiently high altitude for more Boreal forms was probably 

 too small to support any birds or mammals limited to these 

 high altitudes. 



In Round Valley gray squirrels and ground squirrels occur, 

 as well as Eutamias speciosus, K. merriami, Peromyscus mani- 

 culatus sonoriensis and /'. boylei rowleyi. Deer were seen on 

 San Jacinto Peak up to nearly 10,000 feet, at the upper limit 

 of Ceanothus cordulatus. Birds seen on the summit of the peak 

 between 1 :30 and .'!::!<) p.m., -July 27. were: many Sierra juncos, 

 and a lesser number of mountain chickadees, violet-green swal- 

 lows, and white-throated swifts, one family of pigmy nuthatches, 

 one rufous hummingbird, two San Diego wrens, one western 

 house wren, and an unidentified hawk which appeared moment- 

 arily through a rift in the dense cloud bank overhead. 



The members of the expedition who had ascended the moun- 

 tains from San Gorgonio Pass, had a camp in Round Valley 

 from July (i to 12. The two authors of the paper made a visit 

 to Round Valley and the summit of San Jacinto Peak on July 

 27. from their camp in Tahquitz Valley, and the junior author 

 repeated this trip August 1 and 2. 



