Casts with 13 Nansen bottles were made 

 at all stations. The bottle intervals in the 

 upper 200 meters were determined from the 

 vertical temperature structure as indicated 

 by the bathythermogram taken at the station. 

 Below 200 meters they were placed at stan- 

 dard depths (U. S. Navy Hydrographic Office, 

 1955). All bottles carried two reversing 

 thermometers; bottles 5, 7, 9, 11, and 13 

 carried one protected and one unprotected 

 thermometer; all others carried two 

 protected thermometers. 



At the first 8 stations the casts were 

 made to 1,200 meters, but after station 8 

 they were made to only 1, 000 meters. This 

 change in depth was necessary because of 

 the loss of a portion of the wire cable. 



At station 34 (35 "45'N. , 1 71 ° 32'E. ) the 

 bottom three bottles of the cast (600, 800, 

 and 1,000 m. ) fouled a ridge or pinnacle. 

 The position was on a bearing of 340"T. and 

 a distance of 30 miles from a sea mount 

 shown on the chart (H. O. 0528). Possibly 

 an uncharted ridge extending out from this 

 sea mount was fouled. Unfortunately all of 

 the echo sounding equipment was inoperative 

 so bottom profiles could not be obtained. A 

 few, small, pelecypod shells and bits of 

 well-aged coral were brought up in the ther- 

 mometer frame of the 800-meter bottle. 



2. Salinity samples were drawn from each 

 Nansen bottle and returned to the POFI lab- 

 oratory for analysis. Additional surface 

 samples were takenat every third BT on the 

 run from station 40 to Pearl Harbor. To 

 prevent evaporation during storage, each 

 sample was stoppered with a paraffin- 

 impregnated cork in addition to the ordinary 

 screw cap. The salinities of the station 

 samples are given in the station data (table 

 1) and the surface salinities at the BT's are 

 given in the last column of the BT data (table 

 2). The salinity profiles are shown in fig- 

 ures 28 to 30, the surface salinity in figure 

 31, and the salinity on the 25.2, 26.0, and 

 26.8 sigma-t surfaces in figures 32 to 34. 



3. Dissolved oxygen analyses by the Winkler 

 method were made aboard ship on samples 

 from each depth at all oceanographic stations. 

 The results are given in table 1. The pro- 

 files along 160°W., 170°W., and 180° longi- 

 tudes are shown in figures 35 to 37. The 

 distributions on the 25.2, 26.0, and 26.8 

 sigma-t surfaces are shown in figures 38 

 to 40. 



4. Inorganic-phosphate analyses were also 

 made aboard ship by the molybdenum-blue 

 method (Wooster and Rakestraw 1951). 

 Analyses were made on samples from all 

 depths at all stations except 19 through 26. 

 Photometer (Lumetron) failure, which could 

 not be repaired until parts were obtained at 

 Midway, prevented analyses at these stations. 

 The observed values are given in table 1 and 

 the profiles in figures 41 to 43. Adequate 

 charts of the surface distribution and on sur- 

 faces of constant sigma-t could not be drawn 

 because of missing data resulting from in- 

 strument failure and the omission of stations 

 in rough weather. 



5. Bathythermograph lowerings were made at 

 all oceanographic stations and at 30-mile 

 intervals between stations. Cn the run along 

 the islands of the Hawaiian Archipelago be- 

 tween station 40 and Pearl Harbor the inter- 

 val was shortened to 2-1/2 hours or approx- 

 imately 20 miles to obtain a more detailed 

 profile. The observations (Log Sheet B) 

 made at the BT lowerings are summarized 

 in table 2. Figures 13 to 20 are the surface 

 temperature distribution and profiles drawn 

 from the BT data. 



6. Throughout the cruise a continuous record 

 of the surface temperature was made with a 

 recording thermograph. 



7. When weather conditions permitted, Secchi 

 disc observations (total of 12) of transpar- 

 ency and water color according to the Forel 

 scale were made at all daylight oceano- 

 graphic stations. These observations are 

 recorded in the station data headings (table 1). 



Secondary Missions 



1. Oblique 0-100 m. zooplankton hauls of 30 

 minutes' duration with a 1-meter net of 

 30XXX silk grit gauze were made at each 

 station. These data will be summarized in 

 a separate report.—' 



2. From two to six lines were trolled during all 

 daylight runs. The results have been 

 summarized by Shomura and Otsu (1956). 



— ' "Zooplankton distribution and biological 

 indicators related to oceanographic conditions 

 and to albacore abundance in the central North 

 Pacific," manuscript being prepared by E. C. 

 Jones of Pacific Oceanic Fishery Investigations. 



