PLATE 28 



Serial temperature curves eorrespondiug to different months and based on 

 observations made approximately eight miles west of South Coronado Island in 

 sections 40„ 40,, 40^, 4I4, 4I5, 41„ (see note under plate 27 relative to the 

 number of observations). 



Fig. 53. Based on .55 observations; May, 191.j. 



Fig. 54. Based on 380 observations; June, 1911. 



Fig. 55. Based on 151 observations; July, 1912. 



Fig. 56. Based on 56 observations; August, 1910. 



Fig. 57. Based on 117 observations; August, 1911. 



[336] 



