W. Mathews on Glacier-motion. 101 
between 0 and 1 was staked out into nine subdivisions of three 
feet each, and the space between 5 and 6 into five subdivisions 
of six feet. 
Our work was completed in the afternoon of Monday, the 
22nd of August; and the line was re-examined on Wednesday, 
the 24th, after an interval of forty-eight hours. 
In the first place, the spaces between the stakes were carefully 
remeasured, with the following results :— 
Number August 22. August 24. 
of stake. Distances. Distances. 
0, in, ft. 
Se cde Ce 27 0 26 10 
Sige toting peep 33 0 $3.0 
} Regen 30 0 30 0 
elie pe ye. 30 0 30 4 
Bee Ts Oe 30 0 30 0 
6, 30 0 30 0°5 
180 0 160° 20 
subdivisions. The elongation of the space between 3 and 4 was 
ue to the widening of a crevasse which crossed the line 
obliquely in that part. 
The following are the absolute and relative motions of the 
stakes during the two days’ interval :— 
Number Absolute motion. Relative motion. 
of stake. inches. inch, 
GO, Sotieuses ca 8 
i, 3°00 0°50 
So a ae 4°00 1°00 
3, 5°25 1°25 
P tale 3°50 —1°75 
Boe a es 4°50 1°00 
Gyircehs & sions oe 5°00 0°50 
These figures show an increase of differential motion in pro- 
ceeding from the edge of the glacier to a point about thirty 
yards diane and a subsequent decrease in proceeding toward 
hours in points one inch apart. Between 5 and 6 it is only y4'¢2 
of an inch for the same time and space. 
The displacements of the stakes intermediate between 0 and 1 
aad 5 i 6, were also determined. Each intermediate stake 
was found to share in the differential motion. 
