Summary. The problem of the oscillations of the Alaskan glaciers is still far from being adequately solved. More observations at periodic intervals are essential. However, since detailed records are available in the case of some glaciers for over fifty years, the time is approaching when the relative importance of the different factors involved may be determined with some precision, and the means by which glaciers respond to slight changes in climate will be better understood. This in turn will shed light on the problems connected with the broader aspects of the nature of climatic fluctuations.

Wm. Osgood Field, Jr.