PLATE 30 



Serial salinity curves corresponding to different months and based on 

 observations made approximately eight miles west of South Coronado Island in 

 sections 40^, 4O5, 40^, 41,, 41j, and 4l8 (see note under plate 27 relative to the 

 number of observations). 



Fig. 64. Based on 380 observations; .June, 1011. 



Fig. 6.5. Based on 151 observations; July, 1912. 



Fig. 66. Based on 56 observations; August, 1910. 



Fig. 67. Based on 117 observations; August, 1911. 



Fig. 68. Based on 30 observations; August, 1912. 



[340] 



