According to repeated observations, we found the latitude of the Presidio of St. Francisco to be 37° 48' 33", and the longitude 122° 22' 30". The declination of the needle was 16° east.
The medium of our observations in the bay gave us the time for high water, at the new and full moon, 11 hours and 20 minutes.
The greatest difference in the height of the water was seven feet. The rivers which fall into the bay have a great influence on the times of ebb and flow, so that the ebb lasts eight hours, and the flood only four.
THE SANDWICH ISLANDS.