36 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
range to Antelope Spring, where excellent water is to be had in small 
amount. 
In so far as our observations concern the structure, form, and origin 
of the House range, they will be presented in systematic order, instead 
of in the order of dates; the following notes give our route and make 
mention of various items of interest during our week in this district. 
The localities mentioned may be identified on figure 17. 
We spent July 20 near Antelope Spring, ascending to one of the 
great promontories of the steep western escarpment of the range, 
from which we could to advantage overlook the desert basin of Tule 
flat. A creamy playa occupied its central area, and its centripetal 
slopes were contoured with belts of varicolored desert vegetation. 
Many Bonneville shorelines were faintly marked on the sloping pied- 
mont fans below us, 28 being counted with a field glass on one fan, 
and 33 on another. Some rain clouds formed over the range in the 
afternoon; they were characteristic for their small proportion of cum- 
ulus to cirro-stratus, and for the evaporation of their rain trails high 
in the-air, even above the mountain ridges. 
On July 21, we went on westward, descending by a good wagon 
road through a ravine in the mountain escarpment, then following down 
the stony piedmont slope and crossing the playa; here the temperature 
ranged from 98° to 100°, and while by no means agreeable it was not 
so uncomfortable as anticipatory descriptions had. led us to expect. 
We found Indian Spring a little beyond the western border of the 
playa, with a good supply of somewhat warmish water. The highest 
Bonneville shore line that we crossed on the way was several hun- 
dred feet over the playa. At that level as well as lower down the 
piedmont slope, there were occasional small Bonneville deltas built 
on the great fans opposite the ravines in the mountain scarp, and 
many cut shore lines on the intermediate stretches; the cut shore- 
lines have caused the erosion of many narrow gulches in the waste 
slope above them and the formation of corresponding small fans on 
the slope below them. It is noteworthy that the long piedmont 
slopes contain a much greater volume of stony waste than the 
Bonneville deltas, and are therefore of much greater antiquity than 
the Bonneville epoch. Indeed when the larger piedmont fans are 
viewed from a few miles away, the Bonneville shore lines make little 
impression on them. The shore lines and spits shown on the south- 
ern side of the fans at the base of the Sawtooth escarpment in figure 
22 are drawn unduly large. A small ridge of dark limestone, isolated 
in the waste slope south of the road to Indian Spring, and of a 
