PLATE 27 



Serial temperature curves corresponding to different months and based on 

 observations made approximately eight miles west of South Coronado Island in 

 sections 40„ 40^, 40^, 41., 4I3, and 41„. 



Note. — The number of observations on which each curve is based is stated. 

 But this number is an underestimate, since it does not include the observations 

 made at the surface where so many more were made than at any other depth. 



Based on 28 observations 

 Based on 33 observations 

 Based on 62 observations 

 Based on 28 observations 

 Based on 69 observations 

 Based on 94 observations 



February, 1912. 

 February, 1913. 

 March, 1912. 

 April, 1912. 

 April, 1913. 

 May, 1914. 



[334] 



