—81— 
selves so picturesquely around the eternal glaciers. 
As we had to go around the southeastern point of the y 
Wind River Mountains, we now took a more south- R 
western direction. The plain on which we had hith- 
erto traveled changed gradually to a hilly country, 
covered with sandy soil and little grass, but the more 
sage brush, and quantities of buffalo. The geological 
character is very different, since we are on the Sweet 
Waters. Pure granite, basalt, quartz and feldspar 
are now matters of daily observation. Primitive 
mountains begin. We ascended continuously. The 
species of cactus become rarer, the mosses more fre- 
quent. Some plants occur here only in stunted form. 
On the sixth day (July 1st) we left the Sweet Wa- 
ters to our right near their source on the eastern de- 
clivity of the Wind River Mountains. Those are 
the last waters we pass which flow into the Atlantic 
Ocean. That same day toward evening we reached 
a little fresh spring that flows toward the Pacific. The 
divide between these two water systems is formed by 
an undulating sandy prairie. The spring at which 
we pitched our night camp issues from under a rock 
formed of quartz and spar. In the vicinity grew wil- 
lows, cedars and some birches (quickenasp). Where 
the water comes out from under the rock the ther- 
mometer placed in it sank to 43.5 degrees Fahrenheit, 
while it stood in the air at 48 degrees. 
As supplement, I note the averages of the ther- 
mometrical record of our journey, so far of two 
Journey 
along the 
