The author has visited the part of the large glacier Svartisen in Norway that is called Österdalsisen (Fig. 1) in the years 1935 and 1960. An immense wastage during this interval has been established as illustrated by photographs. In front of the western tongue an ice-dammed lake was formed which in 1943 was partly drained towards the east below the ice. In 1959 this draining was made artificial by means of a tunnel in the bedrock. The ice-dammed lake was filled with large ice boulders and it is therefore like the formation milieu of the ablation moraine. The author recommends a continued study of the area. Some mention is given of the insignificant normal deposits (till and sand) of the glacier.