634 TEMPERATUKE OF THE SEA, ETC. 



Strength o£ Salt Solution. 



Temperature, 



(C entigrade 



Scafe.) 



Distilled 

 Water. 



Salt Solutions. 



Volume 

 of Glass 



1 per cent. 



2 per cent. 3 per cent. 



4 per cent. 



5 per cent. 



Hydro- 

 meter, 







1-0007 



1-0083 



1-0159 



1-0235 



1-0312 



1-03877 



0-999612 



1 



1-0007 



1-0088 



1-0159 



1-0235 



1-0311 



1-0386 



0-999638 



2 



1-0008 



1-0084 



1-0159 



1-0234 



1-0310 



1-0385 



0-999664 



8 



1-0009 



1-0084 



1-0159 



1-0284 



1-0309 



1-0384 



0-999690 



4 



1-00092 



1-0084 



1-0159 



1-0233 



1-0308 



1-0383 



0-999716 



5 



1-0009 



1-0083 



1-0158 



1-0232 



1-0307 



1-03815 



0-999741 



6 



1-0008 



1-0083 



1-0157 



1-0231 



1-0305 



1-0380 



0-999767 



7 



1-0007 



1-0082 



1-0156 



1-0230 



1-0304 



1-0378 



0-999793 



8 



1-0007 



1-0081 



1-0155 



1-0229 



1-0303 



1-0377 



0-999819 



9 



1-0006 



1-0080 



1-0154 



1-0228 



1-0301 



1-0375 



0-999845 



10 



1-00058 



1-0079 



1-0153 



1-0226 



1-0800 



1-03737 



0-999871 



11 



1-0005 



1-0078 



1-0151 



1-0225 



1-0298 



1-0371 



0-999897 



12 



1-0004 



1-0077 



1-0150 



1-0223 



1-0296 



1-0369 



0-999922 



13 



1-0002 



1-0075 



1-0148 



1-0221 



1-0294 



1-0367 



0-999948 



14 



1-0001 



1-0074 



1-0147 



1-0219 



1-0292 



1-0365 



0-999974 



15 



1-0000 



1-0072 



1-0145 



1-0217 



1-0290 



1-03623 



1-000000 



The following table contains the corrections for the change of 

 volume of the Hydrometer: 



Temperature. 



Reduction. 



Temperature. 



Reduction. 



Temperature. 



Reduction. 



o 







-0-0016 



o 



5 



-0-0013 



o 



10 



-0-0009 



1 



16 



6 



13 



11 



7 



2 



16 



7 



12 



12 



5 



3 



15 



8 



11 



13 



3 



4 



14 



9 



09 



14 



2 



The observations are divided into four sets — 

 (1.) Those in the North Sea 60° N. lat. 

 (2.) The North Atlantic. 

 (3.) The Polar Sea to the border of the ice. 

 (4.) The Ice-bound sea. 

 The mean specific gravities and corresponding strengths of 

 solution were — 



(1) 1-02545 (2)ri-02594 (3)1 ri-02493 (4) f 1-02411 

 3-511 I 3-578 1 3-439 \ 3-326 



Observations were also made at various points along the coast 

 of East Greenland in July and August 1870, which showed that 

 after the melting of the snow the water collected contained only 

 about 2 per cent, of salt. 



Observations were also made on the increase of specific gravity 

 with the depth, which show some remarkable changes in different 

 parts of the Atlantic and the Polar Sea. 



A useful table is also given in Die zweite deutsche Nordpolar- 

 fahrt, vol ii., p. 697, comparing the summer temperatures at 

 almost all Polar stations in Greenland, Arctic America, and Russia 

 where observations have been made. 



