Table Comparing Summer Daily Motion of Plates on Illecillewaet Glacier, 1899-1906.
| 1899—36-day interval. | 1906—12-day interval. | ||||
| Number of Plate. |
Feet from 1906 ice edge. |
Average daily motion in inches. |
Average daily motion in inches. |
Feet from 1906 ice edge. |
Number of Plate. |
| 1 | 187 | 2.56 | Plate lost | 92 | 1 |
| 2 | 415 | 3.90 | 7.00 | 276 | 2 |
| 3 | 520 | 5.51 | 11.33 | 532 | 3 |
| 4 | 668 | 6.77 | 9.75 | 727 | 4 |
| 5 | 760 | 6.06 | 10.25 | 1,020 | 5 |
| 6 | 900 | 6.79 | 8.85 | 1,171 | 6 |
| 7 | 956 | 6.16 | |||
| 8 | 1,220 | 6.00 | |||
Asulkan Glacier (Glacier House).
Our work here has been on the same lines as on the Illecillewaet, though our observations have not been as continuous, and no map was made and no attempt to measure the rate of flow till 1906.
As respects recession, this glacier has shown more changes than some of the others. In 1901, a distinct advance occurred which lasted for about three years. Then recession again ensued. Our series of observations was somewhat interfered with, because the large boulders in the moraine, which were employed to mark our datum line, were shoved forward by the ice in its advance, entirely obliterating the primary base line for our measurements.
