245 
rock. The tops of the highest peaks are practically only a large 
mass of loose rocks. The picture (fig. 38) illustrates just one 
of the highest peaks. Of course, there is not much vegetation 
there, but these peaks are not wholly without plants. Claytonia 
megarrhiza | have never seen growing except between such rocks, 
and on top of Mt. Peal, the highest, the altitude of which ac- 
cording to the U.S. Geological Survey is 13,089 feet, we found 
Fic. 38. Summit of one of the peaks in the La Sal Mountains, showing slide rock. 
Polemonium confertum, Erigeron trifidus, Arenaria obtustloba, etc. 
On the 19th of July, we returned to Moab. e following two 
days we spent in fixing up the collections made, packing a big 
box of dry aes and two smaller ones of live cactuses, and 
shipping them to New York. On the 22d, we took the stage 
for cara The road runs first up the valley then crosses 
over a low divide into the valley, or rather canyon, of Cain's 
