140 



of 5° or more were required in the inshore area to retain the 

 desired track, which were followed in a few minutes by similar 

 corrections in the opposite direction. These fluctuations in 

 the water motion were not due to tidal action, for the same 

 corrections were necessary on subsequent traverse lines to 

 remain on course. 



WATER SALINITY AND NUTRIENTS 



Methods 



Salinity determinations were made using the titration 

 methods described by Knudsen (1901). Only one titration was 

 made per sample, except in cases where the results were 

 questionable. At intervals checks were made on randomly 

 chosen samples. The results of some of these are shown in 

 Table V. In addition, a series of repeat analyses were made 

 to determine if variations existed due to the different types 

 of bottles used for collectiono These data are shown in 

 Table VI. To minimize the changes due to storage, samples 

 were stored in the same type of bottles aboard ship and 

 analyzed immediately after each cruise. No salinity deter- 

 minations were made aboard ship. 



Subsurface samples were collected from Nansen bottles 

 except for some bacteriological stations where the water sample 

 collected for bacteria determinations was later used for sali- 

 nity analysis. This, of course, was necessary in order to 

 eliminate the chance of sampling different parts of the 

 variable nearshore diluted water. 



Surface samples were collected with a large rubber bucket. 



