“ North of the city the Golden Gate, a passage one mile wide and 4 miles long, connects the bay with the ocean. San Francisco Bay is a beautiful sheet of water completely shut in by wooded mountains 1000 to over 2000 feet high. The water is generally shallow far out from the shores, but the Golden Gate and the part of the bay adjoining San Francisco as well as a central channel running through its whole length have a depth of 30 to over 100 feet. ”