May 18, 1908. Alameda to and from San Francisco, Cal. conditions: Moderate temperature; southerly wind; drizzling in the morning. On the great expanse of mud exposed along the mole this morning I noted only a few distant gulls. On the bay we passed quite a number of immature Larus californicus near Goat Island on the water and flying. They were in various stages of immaturity. When just off the Ferry Bldg. in the morning two flocks of sandpipers (?) of about 30 birds each passed in front of us, headed south. May 20, 1908. San Leandro Bay, Alameda Co., Cal. conditions: Clear; westerly wind sprang up about 9:00 a.m., blowing very briskly later; warm. Started out at 7:00 a.m., and returned at 1:00 P.M., the tide being very low about 10:00 o'clock. Birds were very scarce compared to three weeks ago, most of the shore birds having left. Sterna caspia. When in the mouth of Melrose slough two very large terns with black-tipped primaries passed over high in the air going westward. Sterna forsteri. Common. I saw a flock of about twenty sitting together on the mud at low tide in the middle of the bay. About half the birds seemed in breeding plumage with black caps and long outer tail feathers. The remainder were worn and moult ing, being without