Ocean Temperatures along the West Coast of North America, 



245 



As the motion of oceanic waters is partly determined by their tem- 

 peratures, so their paths may often be traced out by the isothermal 

 curves showing the surface temperatures. As the motion, when normal, 

 is usually less accurately measurable than the temperature, and is much 



8 9 10 



2 MoiitJiS 1234567 



10 II 121 



Fig. 1. Fig. 2. 



Curve for Surface Temperature of the Curve for Surface Temperature of the 

 Ocean, Lat. 32 30', Long. 140. Ocean, Lat, 37 45', Long. 140. 

 Curve for Air Temperature at Yuma, Curve for Air Temperature at Sacra- 

 Arizona, where the Latitude is the same. mento, where the Latitude is the same. 



more rapidly lost, it often happens that the distribution of current water 

 can be more accurately determined by a study of its temperature than 

 in any other way. Thus, by means of its temperature, the existence 

 of a given current can be determined with certainty over an area far 

 exceeding that in which it can be proved to have a perceptible constant 

 motion in any given direction. 



