98 Hydrographical Observations, North Atlantic, 1903 and 1904 



there are fifteen stations, at all of which temperatures were observed ; 

 samples were collected at two. 



The sanrples brought home numbered 139 in 1903, and, by an odd 

 coincidence, 139 in 1904. The chlorines of all these samples have 

 been determined by Mr. J. J. Manley in the laboratory at Magdalen 

 College, Oxford, the methods employed being the same as in previous 

 years. With regard to these determinations, it should be noted that 

 a comparison of the values at the International Station Sc. 19a and 

 Silver Belle station F9 shows perfect agreement. While analyzing 

 the samples brought home by the Discovery expedition, Mr. Manley 

 received a sample of the standard sea-water issued by the Inter- 

 national Council. Chlorine determined differed from chlorine given 

 by 1 part in 3,500. The Discovery samples were treated in precisely 

 the same way as those of the Silver Belle, and there can, therefore, be 

 no doubt that the values are strictly comparable with those of the 

 International investigations. At my request Professor Pettersson also 

 had the chlorines of some of the gas samples sent to him (see below) 

 determined. A comparison of these values with those of Mr. Manley 

 show somewhat serious differences : 



Salinity per Mili.e. 

 No. of 

 Sample. 



7 



IT 



18 



89 - 

 103 

 117 

 124 



The complete agreement which exists between the values as plotted 

 and those of the International sections, and in the determinations with 

 standard water, makes it very difficult to account for these discrepancies. 



Table I. gives the positions of the stations for 1903 and their 

 characteristic numbers. 



Table II. gives the observations for 1903, with the chlorine values 

 (CI), salinities (P), and specific gravities in situ (o- ( ), of the samples. 



Pettersson. 



Manley. 



Difference. 



35 51 



35-70 



-0-19 



35 61 



35-82 



-0-21 



35 23 



35-41 



-018 



3613 



3662 



-049 



3644 



36-58 



-014 



38-35 



38 62 



-0-27 



3620 



35-90 



-0-30 



