26 PACIFIC SCIENCE, Vol XII, January, 1958 
Fig. 4. Sea surface temperatures (°C.) in the Gulf of California. (After Thorade, 1909.) 
aim was geological (Geol. Soc. Amer., Mem., 
1950) but a few hydrographic stations were 
made (Fig. 2). Silicate and phosphate were 
measured for the first time in the Gulf, but 
the methods used in determining the con- 
centrations do not warrant a detailed descrip- 
tion of them. A brief account on the silicate 
distribution in the Gulf was given by Sver- 
drup (Sverdrup and staff, 1940). In 1944 the 
Mexican government sponsored a brief study 
of the Gulf in order to determine the feasibil- 
ity of a minor guano industry (Osorio Tafall, 
1944). The industry was never started. In 1956 
the U. S. Fish and Wildlife Service has planned 
two expeditions into the Gulf to study the 
distribution of sardine eggs and larvae and to 
make frequent hydrographic stations, which 
undoubtedly will bring back new and valu- 
able data for further scientific investigations. 
