Page:Canadian Alpine Journal I, 2.djvu/148

274 the ice to a distance of 43 feet further from the Sherzer Rock, although for the two years previous it appears to have been stationery at that point.

A marked change had taken place. Comparison of photographs from view-point, 79.3 feet south of Rock No. 1 (illustrations Nos. 2 and 3) taken respectively on the 15th of July, 1906, and the 17th July, 1907, shows the change; and, very distinctly, the shrinkage of the forefoot.

It will be noticed that the two great cracks on the right of the 1906 picture are lacking in that of 1907; the further uncovering of the ground-floor may be seen in the centre of the 1907 picture; and the shattered and crevassed condition on the left where solid ice shows in the 1906 picture.

Comparison of the 1907 photographs, illustrations Nos. 4 and 5, with those taken in 1906 (opposite page 158, Vol. I., No. I, Canadian Alpine Journal) from Rock No. 2 and from the view-point 6½ feet nearer the ice that the Vaux marks of 1902 disclose the change to a greater degree. In the first picture the disappearance of the two great cracks, the uncovering of the floor, and the shattering of the ice on the left-hand side is still more marked. It will also be noticed that in 1906 the stream was higher than at the same time in 1907.

In the second picture the pointed nose of ice seen lifted above the ground moraine in the 1906 picture is lying broken off and nearly melted away.

Having completed the above observations, several camera stations were occupied at suitable points to enable, by means of the application of photogrammetry, a map of the tongue of the ice forefoot to be made. The map herewith, which is from the views taken at the