The salinity section, figure 29, shows considerable variation. There is a generally 

 southerly shift in the selected isohaiines when the two sections are compared. Also, the 34.8 /oo 

 isohaline was extended to the north through the region of the Countercurrent; the northerly tongue 

 of 35.0°/oo water, 3 N. , between 50 and 100 feet, has essentially disappeared and the tongue of 

 high salinity water from the south (35.6°/oo, 7 N. to 1 S. ) has broken into two segments. 



A comparable figure for sigma-t, figure 30, shows a similar change in the slope of 

 the isopleths in the region of the Countercurrent. In addition, the relative geographical posi- 

 tions for the selected sigma-t surfaces show a general displacement to the south when comparing 

 the first and fourth sections. 



The most apparent changes in the phosphate sections (fig. 31) are the deepening of 

 the 0.8 cind 2. jig at/1 isopleths in the region of the Countercurrent (associated with the suggested 

 chamge in flow mentioned in discussion of the temperature sections) and the change in configura- 

 tion of the 0. 8 |ig at/1 isopleth near to and south of the Equator. 



Acknowledgement 



1 wish to express my appreciation to the various members of the staff who were 

 responsible for the planning of Hugh M. Snnith cruise 15 and to Mr. Townsend Cromwell who 

 assisted during the preliminary analyses of the data. 



Special thanks are due to the members of the field pstrty who were responsible for 

 the program carried out aboard the Hugh M . Snr^ith during cruise 15. The party included: 

 Joseph E. King (field party chief), T. Roseberry, E. Niska, D. Ching, and D. Yamashita. 



The successful completion of the sea-going oceanographic research program was 

 dependent, in part, on the cooperation and efforts of the Captaiin and crew of the vessel. 



I wish also to express my thanks to Mrs. Mary Lynne Godfrey for her efforts in 

 assuring that the data were accurately processed and to Tamotsu Nakata for the preparation 

 of the illustrations. 



