method and of the dissolved inorganic phosphate bv the Automatic 

 Servo-operated Photometer (Snodgrass et al„ 1953L Portions of 

 each water sample were stored in citrate bottles and returned to 

 the Honolulu laboratory for chlonnity analysis by the Knudsen method„ 



Proc essing of data: Sampling depths were determined 

 using reversing thermometers The readings of protected and un- 

 protected thermometers were adjusted to in situ values by means 

 of graphs o Thermometric depths were computed and plotted on a 

 graph of wire length minus thermometric depth against wire length 

 as developed by R. Reid and described by La Fond (1951 L The 

 actual depths at which all water samples were obtained were deter- 

 mined from this curve G 



Analyses of data; The analyses of the data (their prepa- 

 ration from the tables listing observed values to final presentation 

 in the form of cross sections) were carried out differently from those 

 reported by Cromwell (1951) for cruise 2„ Data from that report 

 have been re-analyzed and the resulting set of cross sections appear, 

 in part, in a report by Cromwell (1953) and the remainder in a paper 

 by Montgomery (1954)„ 



For this report, the treatment of data was similar to 

 that employed by Montgomery for one series of Smith stations along 

 the 158 W, meridian (Montgomery 1954) Q The procedure followed 

 here will be described briefly for those who do not have access to 

 his paper and to point out differences from his method,, 



A temperature -vs -depth curve was drawn for each sta- 

 tion, the curve passing through each observed point (fig Q 1) The BT 

 trace was used to define detail in drawing the upper 200 meters of 

 the curve. A temperature -salinity fT-S) curve then was drawn on 

 the same graph using the same temperature scale,, Thus, the depth 

 or depths of occurrence of any particular salinity can be determined 

 by referring to the temperature -depth curve Successive T-S curves 

 were placed on a light table and altered, where necessary, so that the 

 station-to-station changes were as regular as the data would allow,, 

 Since curves along which sigma-t is constant appear printed on the 

 graph, the depth of any particular value of sigma-t can be read by 

 referring to the temperature-depth curve 



In constructing the cross sections, the depths of selected 

 values for salinity and sigma-t were determined as above and plotted 

 against distance,, The isopleths were penciled lightly on the cross 

 section,, In addition, the values of actual observations were written 

 onto a second cross section using an equivalent pair of scales. The 



