ILLUSTRATIONS 



FIGURE Page 



Frontispiece: Retrieving the No. 2 net at the close of one of the 3 -net hauls, 

 Hugh M. Smith cruise 31. 



1. Track of the Hugh M. Smith (cruise 31) on the EASTROPIC Expedition. . . 1 



2. Diagram of flowmeter -mounting 4 



3. Diagram of flowmeter showing design of propeller -blocking device. ... 4 



4. Operation of the 1 -meter closing nets. 5 



5. Illuminated water bath for holding water samples. 8 



6. Variations in wire angles with latitude for oceanographic stations. ... 9 



7. Positions of temperature -depth sections shown in figure 8. 12 



8. Upper panel, surface temperatures; lower panel, temperature -depth 



sections from BT data 14-21 



9. Oceanographic station curves 22-57 



10. Thernnosteric anomaly in centiliters per ton, 110°W. longitude 58 



11. Salinity in parts per thousand, HO'W. longitude 59 



12. Oxygen in milliliters per liter, 110°W. longitude. 60 



13. Inorganic phosphate in microgram-atoms per liter, llO'W. longitude. . . 61 



14. Smoothed isobaric surfaces relative to the 700-decibar level 62 



15. Thermosteric anomaly in centiliters per ton, 120° W. longitude 63 



16. Salinity in parts per thousand, 120''W. longitude 64 



17. Oxygen in milliliters per liter, 120*W. longitude. 65 



18. Inorganic phosphate in microgram-atoms per liter, 120°W. longitude. . . 66 



19. Smoothed isobaric surfaces relative to the 700-decibar level 67 



20. Thermosteric anomaly in centiliters per ton, 140°W. longitude 68 



21. Salinity in parts per thousand, 140° W. longitude. 69 



22. Oxygen in milliliters per liter, 140°W. longitude. 70 



23. Smoothed isobaric surfaces relative to the 700-decibar level. .... 71 



