114 Apr. 12. Mr. & Mrs. McCaule went to Cornell Hollow. Found young Rock Wrens hatched (See Apr. 9) Apr. 14. Grosbeak on Prospect St. Winter birds scarse. No Varied Thrush or Hermit Thrush. Seen on Campus. Pair of Purple Finches building near Citation Union. Apr. 16. Heard Red-breasted Nuthatch near house. A male Vireo Wren took possession of the flicker box nailed on house (2nd story S.) and sang excitedly (10 a.m.). By 11 a.m. a female appeared and stayed near the box but did not enter while I was watching (until 11:20). At noon both were still there the male in the opening of the box, singing; the female in oceli branches near by. Went & S.F. p.m. Most of the gulls following the boat were California, a few Ring-b., and very few Western. Cloudy a.m. Clear. Cool p.m. Tolmie Warbler singing constantly a.m. Lutescent Warbler not singing - occ. Chirps. Apr. 17 Saw a Hermit Thrush in the garden. Beautiful weather. Apr. 18, 19. Boulder Creek. Many birds singing: Grosbeak, Waryling Vireo (4) Olive sided Flycatcher Black-throated Gray Warblers. Pileolated Warblers? On Ben Lomond Mt. Audubon Warblers, Black Throated Gray Warblers, Purple Finch Wrentits, Creepers. In way down (Apr. 18) heard Yellow Warbler in three places. At Mrs. Blaats in Uninda, House Wren nesting in low stump, W. Flycatcher under platform of Tea house. Apr. 20. Berkeley. Tolmie Warbler and Vireo Wren, singing constantly - Pair of Lutescent Warbler and pair of Titmouses send Bluejay whenever he comes near. Young Titmouses noisy. Found nest of Lutescent Warblers above a small perch in the bank above dining room Terrace-