Two or more chlorinity determinations were 

 made with each sample, employing the Knudsen 

 method, and these were converted to salinity. 



Temperature was measured with standard revers- 

 ing thermometers, and the necessary correc- 

 tions (index, etc.) were carried out at the 

 Scripps Institution of Oceanography to give 

 in situ values. When corrected temperatures 

 of paired protected thermometers differed by 

 more than 0.06°C, both values appear in the 

 tables. The temperatures listed at depth 

 are actually at an average depth of 1.5 m. 

 below the sea surface. 



Depths are based on readings of paired 

 (protected and unprotected) reversing ther- 

 mometers . 



Nansen bottle spacing was determined by the 

 thermal structure of the water and an attempt 

 was made to place the bottles at equal -temper- 

 ature intervals rather than at equal-depth 

 intervals. 



Corrections have been made using the tables 

 of Harvey (The Chemistry and Fertility of 

 Sea Waters, Cambridge Univ. Press, 224 pp., 

 1955). 



6. Alkalinity 



Alkalinity was determined using the method 

 of Anderson and Robinson (industrial and 

 Engineering Chemistry, Analytical Edition, 

 Vol. 18, p. 767, 19h6). These are reported 

 for atmospheric pressure and are accurate to 

 0.01 millival/l. 



7- 



Nitrite 



Nitrite measurements were made with a Beck- 

 man DU Spectrophotometer employing the 

 method of Bendschneider and Robinson (Jour. 

 Mar. Res., Vol. 11, p. 87, 1952). The data 

 are reported in u gm at/l NO -N, and the 

 accuracy ranges from 5 to 10%. 



8. Inorganic phosphorus 



Only values at observed depths appear . As it 

 will be some time before all station curves 

 are drawn, it was decided to submit the data 

 in the present form. 



.h. Surface current by Geomagnetic Electro- 

 kinetograph (GEK) 



All measurements were made with neutrally 

 buoyant cable. The conversion from measured 

 electrical potential to surface current was by 

 the formula E = -VH S where E is the measured 

 potential, V the surface current, H the 

 vertical component of the earth's magnetic 

 field, and S the interelectrode distance. No 

 corrections, therefore, have been made for 

 "depth of current," "electrode droop," or 

 "windage on electrodes." 



5- pH 



The pH of samples was determined with a Beckman 

 G pH meter employing glass and calomel 

 electrodes. The values given are for in situ 

 conditions and are accurate to 0.02 pH units. 



Phosphate concentrations were measured 

 using the method of Wooster (Jour. Mar. Res.j 

 Vol. 10, pp. 91-100, 1951). Duplicate 

 samples were not analyzed. 



9. Dissolved oxygen 



Dissolved oxygen measurements were made 

 using the Winkler technique according to 

 the directions of Wooster (Methods in 

 chemical oceanography. . .employed in the 

 California Cooperative Sardine Research 

 Program. Scripps Inst. Oceanogr., Tech. 

 Rept., 27 pp.). 



10. Chlorophyll "a" 



The water samples used for the determina- 

 tion of chlorophyll "a" content were 

 collected from the surface with a plastic 

 bucket; subsurface samples were collected 

 with a Van Dorn-type plastic sampler. The 

 water sample, 3. 0-6.0 1. in volume, was 

 shaken after the addition of a small amount 

 of magnesium carbonate, and filtered through 



