Hydrograplrical Observations, North Atlantic, 1903 and 1904 99 



Table III. gives the data for the 1904 cruise. The positions of 

 the sounding stations are given on the charts (Plates I. and II.). 



A number of samples for gas analysis were collected during the 

 1904 cruise. The tubes were sent to Professor Pettersson, in Stock- 

 holm, and the analyses carried out by Miss A. Palmquist in the 

 Hogskolas Laboratorium. The results are given in Table IV. 

 Column 1 gives the number of the station, as in Table III. ; columns 2 

 and 3 the depths from which the samples were obtained ; column 4 the 

 amount of nitrogen (N 2 ), measured in c.c. at 0° C, 760 mm. 

 pressure, absorbed in 1 litre of the sample ; column 5 the amount 

 of oxygen (0 2 ), measured at the same temperature and pressure, 

 absorbed in 1 litre of the sample ; column 6 gives the amount 

 of oxygen expressed in per cent, of the whole gas absorbed — i.e., 



== jy 5 column 7 the amount of carbonic acid (C0 2 ) measured 



JN 2 + U 2 



in 1 litre under the same conditions. This carbonic acid is partly 



absorbed, partly in chemical combination. 



With reference to these analyses, Miss Palmquist writes : 



' Several tubes were so thinly drawn out that it looked as if they 

 were melted together, though they really were open. If a tube is 

 open, the nitrogen and oxygen can, of course, not be analyzed, and 

 usually I do not either determine the carbonic acid, as the result often 

 becomes too high. But as the opening of these tubes was so very 

 capillary, I thought it better to analyze them ; the results are 

 marked " ?" 



'The point of the tube from Station 41, 150 fathoms, was quite 

 broken, and the result is obviously too high. 



' Both of the samples from Station 8, 1,200 fathoms, were not 

 melted together. The air bubble in one of these tubes being rather 

 small, and the thin tube being quite filled up with water, I thought it 

 just possible that the nitrogen and oxygen might be correctly deter- 

 mined. Although the result was too high, and some air must have 

 come into the tube, something might be got out of the analysis. The 

 deep water at the Stations 2 and 8 seems to be about the same, and the 



13—2 



