Miscellaneous Intelligence. 247 
regular and broken, the bighest point being near the west mar- 
gin; at the south end they are much more regular, the highest 
point being near the eastern flank. The average elevation of this 
extensive table land is about 4,000 feet above the sea. 
D e average ascending grade along Captain Pope’s line, from 
reston to the margin of the Llano Estacado, is about ten feet to 
the mile, 
e average ascent along Lieutenant Whipple’s line, from 
i he margin of the Llano 
b 
Cheyenne it is over nineteen feet to the mile. 
as m Fort Union, at the mouth of the Yellow- 
b ne, to Fort Benton, is only about two and a half feet per mile ; 
ut from there west to the base of the mountain it increases 
rapidly until it averages about twenty feet to the mile. 
of Colorado 
moun- 
mes, lies directly 
of Colorado and northern boundary of Nebraska; second, the 
horthern line i t measured directly at right angles with the 
range. The line along the Yellowstone would give the ascent 
more correct J: 
It would be an interesting problem in mathematical geology 
(if we may use such a term) to ascertain the immense amo 
débris covering these vast. plains which has been washed down 
m to form some estimate of their 
at mountain plateau which 
Wahsatch range is about 6,500 
feet above the level of the sea, and is about 1,200 feet above the 
aera borders of the plains, and 2,200 feet above the Salt Lake 
sin. . 
The average fall of the principal rivers is as follows: 
Of S 3 P P about five feet to 
the Rio Grande, from Isleta to El Paso, : 
gpa but from Isleta south for some distance it is about six 
eet. 
