| Summary: | Reports a study at Fairbanks, Alaska, 1954-56, on the thermal environment of the moss-covered forest floor, the habitat mainly of red-backed voles, shrews, weasels, and red squirrels. Thermistors recorded temperatures at the surface, 6 ft above, and 3, 6, and 9 in below. Findings during the snow-free and snow periods are discussed, including stable temperature comparatively warm in winter and cool in summer. Effects of various snow cover thickness on the range and fluctuations of subnivean temperatures are noted. Contrast between the under-and above-snow environments causes the mammals to abandon surface activity when the cover reaches 15-20 cm depth.
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