two were superimposed on a light table and the isopleths modified 

 consistent with the observed values,, Up to this point in the treatment 

 of the data, the procedures follow closely those described by 

 Montgomery (1954) 



Montgomery used an analogous procedure to construct 

 cross sections for inorganic phosphate and oxygen c The method used 

 here for these two fields was less rigorous but also less time consum- 

 ing,, The observed values of inorganic phosphate were written onto a 

 cross section using depth and distance scales equivalent to those used 

 in drawing the sigma~t section,, This sheet was then placed over the 

 completed sigma-t section on the light table,, The isopleths were 

 drawn as nearly as possible along the sigma-t surfaces, but not in 

 violation of any of the observed values,, This was done in accordance 

 with the principle used in isentropic analysis, namely,, that water 

 flows along surfaces of constant potential density funder certain con« 

 ditions rather generally encountered in the ocean' ; these surfaces 

 being very nearly coincident with surfaces of constant sigma-to The 

 same procedure was used in constructing the oxygen cross sections „ 

 Neither inorganic phosphate nor oxygen is a conservative property, 

 but proceeding as though they are probably leads to the most accurate 

 cross sections possible in the absence of quantitative information 

 about the biological processes. 



Some Results of Hugh M„ Smith Cruises 5 and 8 



The station pattern for the June - August cruise of 1950, 

 cruise 5, appears as figure 2 while that for the January = March 

 cruise of 1951, cruise 8, is shown in figure 3. Each of these two 

 cruises comprised primarily two lines of stations, one each along 

 158° W and 172 W Cruise 8 included additional stations along a 

 zigzag course between 155° W and 169 W longitude 



The cross sections appearing as figures 4-32 are based 

 on data collected along the four meridional station lines and stations 

 62-76 of cruise 8 along a NNE-SSW course (fig„ 3). Figures 4-10 re- 

 sult from data collected along the station line 1-27 of Smith cruise 5 

 (figo 1), primarily along 172° W longitude These figures are in the 

 sequence dynamic topography, geostrophic currents, BT, sigma-t, 

 salinity, phosphate, and oxygen This sequence is repeated for each 

 long line of stations on Smith cruises 5 and 8, except that the sigma-t, 

 salinity, phosphate, and oxygen sections based on stations 28-51 of 

 Smith cruise 5 appear elsewhere (Cromwell 1953) and are not repro- 

 duced here Stations 27-61, on the zigzag portion of Smith cruise 8, 

 are not represented by cross sections. 



