276 



G. F. Me E wen. 



former value was resumed. Also, regions of alternately warm and cold 

 water on a line parallel to the coast have been repeatedly observed (17) 

 similar to those much farther north mentioned by Hoi way (9). And 

 the lowest temperatures were found just in the regions where the maxi- 

 mum upwelling would be expected. The irregularities in temperature 

 distribution may be accounted for by recalling the factors that we 

 have found influenced the distribution on a large scale. The fluctua- 

 tions with respect to time would result from a change in the wind, and 



Miles 



Depth of 



Water, n 

 Meters 



Fig. 16. 

 Isotherms for a Course from South Coronado Island eight miles west August, 1910. 



the variations with respect to location would result from differences in 

 the wind, irregularities in the depth and slope of the ocean bottom, 

 and in the presence of submarine valleys. 



Several lines of serial temperature measurements 1 ) have been made 

 running from the coast out the distances of 10 or 20 miles. The re- 

 sults of two of these sets of observations shown by (Figs. 16 and 17) 

 are typical of the others. During these observations the direction of 



*) The following data on ocean temperatures was copied from un- 

 published records on file at the laboratory of the Marine Biological 

 Association of San Diego at La Jolla, California. 



