The magnitude of recent glacier recession in this area has been brought to light by means of detailed mapping of several of the larger glaciers and examination of many-others. Results indicate that since the beginning of the present century some of the principal glaciers have been reduced 40-75 per cent in area and more in volume. Several smaller glaciers have nearly or entirely disappeared during the same interval; and in a warm, dry summer all snow from the previous winter is dissipated from the firn areas or zones of accumulation on nearly all the glaciers.