J.G. Hall 1953 July 17 Sagerhen Creek 3mi. NW Hobart Mills, Nevada Co., Calif. immediately replaced by another head colored metallic blue. This bird also flew out at 11:35 + was replaced in the hole by another brown-headed bird. I have assumed these to be tree swallows but Dr. Miller thinks v.g.'s more logical. Will have to make sure. 11:45 a small bird (Chippy?) flew from a nest constructed in a pocket in the earth field in the up-ended roots of a large fallen L-pole just above July 18 the Kilm Meadow-ford. Rockslide Colony 9 AM & Leopold. More talk on measuring willow-use: pick a strip which has both aspen willow when possible: [illegible]. Red Hoffman's article on Range-survey methods. Draw maps & concentric circles with "isocuts" change maps by years or months. July 25 Lower Colony, 9 A.M. (with G.H. Miller and B. Hoffmann) On way down to colony Dr. Miller pointed out many birds to us. Solitary vireo in an aspen by the stream. Tolmie warblers in willows of stream border. Dr. Miller shot 2 P; plumage well worn he said. Andu- Also yellow warblers bon's warbler seen. Red-tail hawk soar-