The Motion of the Nisqually Glacier. iii 



were left open, their positions being identified by small 

 piles of stones a few feet down-stream. Their size in- 

 creased slightly in the course of two days, but the circular 

 form was perfectly preserved, enabling a measurement 

 to be made to the center of a hole with an accuracy of 

 two or three tenths of an inch. They were rebored every 

 two days. 



The locations of the various holes with relation to 

 one another and to the edges of the glacier are as 

 follows : — 



Eastern edge to No. i 200 feet. 



No. I " No. 2 20s " 



No. 2 " No. 3 153 " 



No. 3 " No. 4 105 " 



No. 4 " No. 5 147 " 



No. 5 " No. 6 163 " 



No. 6 " No. 7 SO " 



No. 7 " No. 8 206 " 



No. 8 " No. 9 179 " 



No. 9 " Western edge 75 " 



Total width of the glacier 1,483 feet. 



Figure A is a plan on this line, and Figure B a profile. 



The distances were measured with a hundred-foot steel 

 tape. Hole No. i was in the middle of the west lateral 

 moraine, which is here 400 feet wide. Nos. 2, 3, 4, and 

 5 were in the clean white ice of the main stream, No. 6 

 in the top of the medial moraine, and No. 7 a short 

 distance west of it, but this hole was lost soon after 

 the measurements were begun. No. 8 was in the narrow 

 strip of clear ice west of the medial, and No. 9 near the 

 edge of the western lateral moraine. The positions of 

 these holes may not be the best, but they were in general 

 necessary for clear seeing from the transit stations. 

 Holes Nos. 1-6 were observed from the East Base, and 

 the others from the West Base. The base-line was not 

 exactly at right angles to the axis of the glacier, which 

 is assumed to be parallel to the sides ; the sides having a 

 very gentle curvature for a mile above the section meas- 



