139 [ 174 J 
sat_up for an observation of the first satellite of Jupiter, 
Mek took place about midnight; but fell asleep at «the 
2 
foe? eee tt 
; 
0 
2 
ine norn iT 4 i \ rie 
“smoky; and the temperature at sunrise 28.5°. At the same time, the tem- 
; and that of the steam hole, 
quits the valley of Bear river, and, crossing ’a ridge which divides the G 
: river, in a distance of probably fifty miles, or two and a half days’ journey 
sera the principal feature of geographical interest in the basin, was 
one main objects contemplated in the general plan of our survey, and 
bend, the river here passes between lar walls of basalt, which 
#!ways fix the attention, from the m in which it occurs, and its 
perfect distinctness from the st among which it has been 
placed. The mouptain, which is : by our 
laced. The mouptain, which is ragged and steep, and, by our measure- 
‘ment, 1,400 feet above the river directly Opposite the place of our halt, is 
called the Sheep rock—probably because a flock of the common mountain 
vertical, and disposed | masoury ina very t gular 
osed of a brown-colored scoriaceous lava, evidently 
