54 University of California Publications in Zoology [ Von. 14 
In figure K, we have compared the annual temperature curves 
for San Francisco Bay, and for the adjacent parts of the Pacific 
Ocean, with those for the waters of two points along the Atlantie 
Coast. 
San Francisco 
Chesapeake 
-itc . Woods Hole 
Jan. Feb. Moar. Apr. May Jun. Jul Aug Sept. Ocl. Nov. Dec 
Fig. K. Comparison of annual water temperature curves for San Francisco 
Bay (based on findings of present survey), the neighboring ocean (figures of 
Thorade), Woods Hole (records of U. S. Bureau of Fisheries station) and 
Chesapeake Bay (records of light-house keepers, in files of U. S. Bureau of 
Fisheries). 
Let us consider first that for Chesapeake Bay. The figures upon 
which this curve is based are derived from unpublished observations 
made for the United States Fish Commission by lighthouse keepers at 
eight different points, which, with the exception of Baltimore, lay in the 
