102 W. Mathews on Glacier-motion. 
The measurements were confined to a breadth of 60 yardsin — 
a part of the glacier where the distance from side to center — 
was not less than 600 yards, and consequently only exhibit the — 
deportment of the side ice. It was important to supplement 
them by examining a glacier in the central portion of the stream; : 
and, I being obliged to return home, Mr. Reilly devoted three 
weeks to this purpose, and has generously placed his notes at — 
my disposal. 
ture,” the remaining 120 yards being ordinary glacier-ice. 
Mr. Reilly bored the first hole about 70 yards from the ‘i f 
exhibited in parallel columns, the negative signs indicating 
Right moiety. | Left moiety. ae 
Stations. Saat | aes | Stations. ie | eeton 
if Teepe eae ft. in. 
0, | 11 650 
1, | 10 11°60) ~6-90 | | 
2, | 11 4:25; 4°65 
8, | 11 3:00! —1-25 17, | 11 0°50 ? 
4, | 11 7-05] 4-95 16, 1.11 9°00|. 3 : 
5, 11 6°75| ~—0°50 ib, | 31. 4 ey 
6, | 11 525] —-1:50|| 14, | 11 650| -000 497 
7, | 11 650] 1-95 18, | 11 #60) a 
8, | 11 6-00! —0-50 12, | 11 7°50 ee : 
% | 11 9-00) soo} 11, | 11 7-00) =OR8. 
|__10, | 11 10-00] 1-00l] 10, | 11 10°00] 300 
Here we have a superficial area of ice 170 yards 1D ee : 
moving through a space of nearly 12 feet in twenty wee : 
an advance of the center during that interval only 10 mob" 
rches, and at the center 1 inch in a width of 360 inches © 
that two points an inch apart would in twenty-four hours aa 
