1911.] NATURAL SCIENCES OF PHILADELPHIA. 175 
and well worth investigation 
on these two trails, both of 
which are easily accessible. 
In 1909 (August 19 to Octo- 
ber 25) Messrs. Ferriss and L. 
KE. Daniels extended the work | 
to the region north of the Grand 
Canyon, exploring the Powell 
Plateau and the western side 
of the Kaibab Plateau, going 
as far north as Kanab, Utah. 
A long and hard trip was also 
made westward to Mt. Trum- 
bull. The route and stations 
are partly shown in fig. 2. The 
northward extension of the 
route, to Fredonia, Ariz. (Sta- 
tion 38), and Kanab, Utah, is 
not shown on the map. From 
Fredonia the route led south- 
west to Pipe Spring, Vermillion 
Cliff (Station 39), to Yellow- 
stone Spring, southward across 
Antelope Valley (Station 40), 
to Mt. Trumbull, where the fol- 
lowing stations were occupied: 
43, Base of northwestern part 
of mountain, 6,700 feet. 
44, Spring at northwestern 
part of mountain, 7,000 feet. 
45, Northwestern part of 
mountain, 6,700 feet. 
46, Hurricane Fault, 8 miles 
from Mt. Trumbull, 6,000 feet. 
Station 41 is close to the 
figure 6, on the Kaibab Sheet 
Fig. 2.—Part of route and collecting 
stations, expedition of 1909, north 
of the Grand Canyon. 1000 ft. 
contours traced from U.S. Geol. 
Surv. topographic map, Kaibab 
sheet, edition of March, 1886, re- 
printed January, 1900. 
