2 
computed and found to be + 0.02° for single observations and +0.015° 
for the mean of duplicate observations. 
Unprotected reversing thermometers were used in conjunction with 
protected thermometers to determine the depth of sampling. At 
stations where the cable was vertical the accuracy of this method 
could be checked. The probable error in depth of sampling, when 
relying on the unprotected thermometers, was computed and found 
to be less than + 5.meters. 
Chlorinities were determined by titration with silver nitrate solu- 
tions standardized against standard sea water. The corresponding 
salinities were then found by referring to Knudsen’s tables. The 
accuracy of the results obtained by this method is of the order of 
+ 0.02/99. | 
The o, and. V,, 4; » values were computed from tables prepared we 
Dr. G. F. McEwen of the Scripps Institution of Oceanography. 
In the tables are indicated certain other observations, collections, 
and analyses that were made at the stations. Surface plankton 
collections were made at most of the stations and at other locations 
in the region covered by the survey. Certain chemical analyses were 
made on board the U.S.S. Hannibal during the course of the survey. 
These include serial determinations of the amount of dissolved oxygen 
in the water colunm at 93 stations, phosphate series at 5 stations, 
silica and nitrite series each at 2 stations. At the Scripps Institution 
of Oceanography serial water samples from three stations have been 
analyzed for boron content by Miss K. Gehring, technical assistant.’ 
The chlorinity determinations were all made by Miss K. Gehring. 
The temperature corrections, thermometric depth computations, 
checking, and the preparation of these tables were carried out at the 
Scripps Institution of Oceanography, where the author is preparing a 
complete report on the physical oceanography of this region based on 
these data and the additional observations as indicated in the tables. 
EXPLANATION OF . TABLES 
For each station a general form has been used that gives the loca- 
tion of the station and other pertinent material as well as the tempera- 
ture and salinity data on the samples collected. ' Most of this mate- 
rial has been taken from the forms used to record field notes and 
observations, namely, “Oceanographic Observations—Temperatures: 
and Salinities’’ (H.O.Misc. No. 8027-3). For those stations at which 
the observations were not made at the standard depths a second table 
is attached which contains the temperatures and salinities at stand- 
ard depths obtained by interpolation from graphs constructed from 
the observed data. ) 
“Most of the headings on these tables are self-explanatory. “Wire 
angle” is that which was found by measuring the angle that the cable 
