The recession of the Swiss Glaciers proceeded with increased speed during 1947. In his annual reportFootnote * Dr. P. L. Mercanton points out that during the winter of 1946/47 the precipitation averaged some three-quarters of normal, while during the six summer months the mean temperature and insolation exceeded their normal values by 3° C. and 20 per cent respectively. The resulting ablation removed not only the whole of the winter accretion of snow but also a large quantity of the reserves of glacier ice. The only recorded exception was on the Jungfraufirn, where a small surplus of winter snow remained. On the Bristenstock the firn line rose to 2520 m., about 170 m. higher than in 1946 and 270 m. higher than in 1945. Some exceptionally heavy recessions of glaciers are noted in the tables given; the Allalin Glacier snout receded 140 m., the Tsanfleuron Glacier, in the basin of the Aar, 41 m., the glacier from Piz Sol in the Rhine basin 73 m., and the Basodino Glacier in Ticino 116 m. In 1946 13 per cent of the glaciers measured had advanced, 7 per cent were stationary and 80 per cent were in recession.Footnote † In 1947 none advanced, 2 per cent were stationary and 98 per cent had retreated.