II2 FizeLp CoLuMBIAN _MusSEUM—GEOLOGY, VOL. I. 
eral a course transverse to that of the mountain, and cut into its east- 
ern and western slopes. Whether glaciers descend several of these, 
as Heilprin states, I do not know, but it seems not improbable. Some 
of the residents of the region, however, though they knew of the one 
ventisguero, as they call a glacier, z. ¢., the one visited by me, were 
quite sure that it was the only one. 
The glacier named by Heilprin, Porfirio Diaz Glacier, fills the 
valley lying on the northwest of the mountain between the central 
and southern peaks. Its upper portion lies ina saddle-shaped depres- 
sion about three-fourths of amilewide. The valley then narrows and 
descends in a direction west-northwest to a well-marked terrace which 
skirts the western slope of the mountain a few hundred feet below 
the snow line. 
Judging from the slope of the snow field, the average slope of the 
valley is about 30°, but it is somewhat steeper in the lower part. 
Tributary to this main valley another lies between it and the central 
peak, separated from the main valley by a small spur of the moun- 
tain, which I propose to call Heilprin Peak. The slope of this val- 
ley is much greater than that of the main ice trough, being often as 
great aS 45°. 
COLLECTING GROUND OF THE GLACIER. These two valleys 
constitute the collecting ground of the glacier, and the narrowed pro- 
longation of the main valley forms the trough wherein lie the middle 
and lower parts of its course. The glacier, therefore, is of the broad, 
Alpine type. Its greatest length from the main ridge to the terminal 
moraine can not be more than one and one-half miles; a course so 
short that one would doubt the possibility of an ice-flow were it not 
proved by other evidences. 
From only three exposed peaks can the glacier gather moraine 
material; these are the southern and Heilprin peaks, and the south- 
ern slope of the central peak. Owing to the limited source of supply 
and the short course of the glacier, the formation of well-marked 
lateral moraines does not take place. ,The nearest approach to any- 
thing of this sort was seen in a number of bowlders showing some- 
thing of a lineal arrangement, which lay at the time of the writer’s 
visit at the base of the southern peak. About the base of Heilprin 
peak also, lay an extensive deposit of clay and bowlders. This 
material is not carried out into the main body of the glacier as one 
would suppose from the course of the valley, but is crowded off to the 
northern side where it is distributed along the foot of a cliff extending 
in the direction of the glacier. I am not sure but the ice mass 
between Heilprin peak and the central peak should be considered a 
“a 
