Bishop, Inyo Co., Calif. Jan. 6, Since Sunday, Dec. 27, 1936, the ground has been covered with snow. The first snow fell on this date in December - at the end of this fall (about Dec. 30) approximately 2ft. of snow on the level was present. All low-lying vegetation-even Artemisia tridentata - was covered. During the period Dec. 27-Dec. 31 I made several trips afield, hiking about 2 1/2 mi. to the east, south and north of Bishop. Immediately after the snowfall no tracks of mammals were seen. However, the following day (2 days succeeding the cessation of snowfall) tracks were abundant in the open fields and along road- and canal-sides. Jackrabbit and cottontail tracks were most numerous, concentrated along ditch banks where vegetation was exposed. Smaller tracks I believed to be those of Peromyscus and Reithrodon tonyx were seen to lead from clump to clump and around almost each clump of the composite which abounds here. Most of these led ultimately to the dried head of these plants. Here was a supply of food that could not be reached when snow was not on the ground.