I915- ^C>- -• SPITSBERGEN WATERS. 



On two occasions we went into the ice, and remained there for some 

 time making current-measurements while the ship was moored to the ice- 

 floes, and the practicability of this method was proved. 



The quantity and oxygen of the sea water was examined by the 

 Winkler method at various depths at a number of stations. The ionic 

 concentration of hydrogen of the sea-water was examined by the 

 Palitzsch method. Samples were also taken for the determination of the ni- 

 trogen compounds of the sea-water, the samples being sterilized by subli- 

 mate ; but as no sufficiently accurate method has yet been found for these 

 investigations, the results obtained are of no value. 



During the cruise, all obser\ations and readings were taken by myself, 

 with the exception of the surface-obser\ations which in most cases were 

 taken by Mr. Gröndahl. 



Water-Bottles. The water- samples were taken with the following 

 water-bottles: 



An Automatic Insulating Water-bottle (marked A in the Tab- 

 les I used at the first 5 stations. This water-bottle, which was also used 

 on the cruise of the ^Frithjof« in 1910 [1913. p. 7], works verj- well, and 

 gives reliable samples. The instrument has not yet been described. 



The Pettersson-Nansen Insulating Water-bottle Imarked FN 

 in the Tables^ was used on several occasions. 



An Ekman Reversing Water-bottle ([marked E in the Tables» 

 was also used. In order to avoid the possibility of this bottle not closing 

 properly when reversed, the end of the reversing cylinder had been given 

 an extra weight of lead, which made the bottle close more salely ; but on 

 a few occasions the samples taken with this bottle seem none the less some- 

 wha: doubtful. 



Two stop-cock water-bottles of my construction (marked I and 

 II in the Tables) with an arrangement for reversing thermometers were 

 used at most stations, and were attached to the side of the same Une at 

 different depths. They were the same bottles that were used during the 

 cruise of the "Frithjof in 1910 [1913. p. 7]. They always worked well. 

 I had now had the reversing tube fitted with an extra tube, so that two 

 reversing thermometers could be used simultaneously in each instrvunent. 



The Reversing Stop-cock Water-bottle of m\' construction 

 Imarked RB in the Tables), mentioned in my paper on the cruise of the 

 Frithjof [1913, p. 7] was also used at a number of stations. It was attached 

 to the side of the line. 



