NOTES ON THE TABULATED DATA, 

 HMS-25 



In every case, any variation from 

 the standard 13-bottle cast has been noted and 

 explained. (See explanatory code.) 



Where more than one cast was taken 

 on a station, they are divided in the observed 

 data by a horizontal line. The cast number is 

 indicated by a Roman numeral at the left 

 margin. 



Where the duplicate temperature 

 readings differed by more than 0. 05 below 

 300 m. , or more than 0.10 above 300 m. , 

 and where the duplicate salinity titrations 

 differed by more than 0. 02 /oo, and where 

 the duplicate phosphate determinations differed 

 by more than 0.01 extinction (about 0.05 \ig. 

 at/1.), both values were plotted on the station 

 graphs. If one of these values was used in 

 drawing the curve, it is carried in the data 

 and the other discarded. If no choice can be 

 made between them, the value interpolated 

 from the curve is used. This interpolation is 

 rare in the salinity values and is indicated 

 where present; it is common for phosphate, 

 and not indicated; it did not occur in the tem- 

 perature values. 



Explanatory Code for Tabulated Data 



a/ No analysis made for this property, or 

 analysis faulty and discarded. 



b/ Nansen bottle pretripped; no water sample 

 or temperature. 



c/ Individual water sample lost. 



d/ Value definitely bad and discarded. 



e/ Value seems anomalous, but not positively 

 out. 



f/ Only one titration made due to insufficient 

 sample. 



g/ Duplicate salinity titration values differ 

 by more than 0.02 /oo but less than 0.07 

 /oo; value tabulated is interpolated be- 

 tween the duplicates from the station 

 curve. 



Weather is recorded in the ww 

 (present weather) code given in the U. S. 

 Weather Bureau Circular M, eighth edition, 

 Manual of Marine Meteorological Observations . 

 Cloud cover is given in tenths of sky covered. 

 Wind velocity was measured with an anemo- 

 meter 30 meters above the sea surface. The 

 direction (given to the nearest 10 ) is that 

 from which the wind was blowing, measured 

 clockwise through 360 from north. 



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