1915] Michael, ft al. : Hijdrojjrirpliic Records of i^cripj>s Institution 45 



PART 2 

 TABULATION OF DATA 



A. General Explanation of Tables 

 (a) Arrangement. — While all our data fm-m an or^anie whole 

 they have, for convenience in use as well as in tabulation, been ar- 

 ranged into several tables. The hydrographic data are tabulated first 

 because they have an intrinsic value in addition to their es.sential 

 relation to the plankton and dredge collections. Accordingly all the 

 data relative to ocean temperatures and salinities are given in Table 

 1, those relative to San Diego Bay in Table 2, and the supplementary 

 data concerning gas content and soundings in Tables 3 and 4. Again, 

 while all the biological collections were accessioned in chronological 

 order irrespective of the nature of the haul, plankton collecting has 

 been carried on much more extensively than dredging, so that the data 

 relative to plankton hauls are given in Table 5, and the dredge hauls 

 in Table 6. All tables are arranged on the same general plan. 



(&) Recording of position. — All positions are entered in latitude 

 and longitude, the latter being measured from Greenwich. When- 

 ever the error (see p. 18) was estimated as lass than half a mile the 

 position, except as .stated below, is entered to tenths of one minute. 

 In those instances where the error lay between one half and one mile, 

 it is entered to the nearest even minute, and in those rarer instances 

 where the error was still larger the latitude and longitude are not 

 entered at all, the approximate position being given by the section 

 (see p. 46). 



Unless otherwise noted in the tattles, the boat was allowed to drift 

 during the actual collecting. In case the position at the end of the 

 drift was determined, the latitudes and longitudes relative to the 

 collections are not entered as such, but the initial and final positions 



together with this .statement are given : ' ' Prom to the 



boat drifted from the above position to the following position," the 

 blanks being filled in with the times corresponding to the two positions. 

 In some rare instances, however, it has been impossible to determine 

 the amount and direction of drift ; in such cases the initial latitudes 



