PHYSICAL PROPERTIES OF ICE. 



639 



Analysis of the Arctic Sea Water. 





No. 2. 



No. 7. 



Sesquioxide of iron and 



phosphate 







•010 



•022 



Insoluble lime 



- 



- 



- 



•027 



•091 



Soluble lime 



- 



- 



- 



1^260 



•474 



Insoluble magnesia 



- 



- 



- 



•110 



•081 



Soluble magnesia - 



_ 



- 



_ 



•571 



•491 



Sodium 



^ 



_ 



. 



10^853 







Potassium - 



_ 



_ 



. 



•384 



•432 



Chlorine 



_ 





_ 



17-950 



17-585 



Sulphuric acid 



_ 



_ 



_ 



1-986 



2-040 



Carbonic acid 



- 



- 



- 



•284 



•260 



No. 2. — Four feet below ice. 



No. 7. — Ten fathoms, at spring tide. 



Composition of the Sea Water of Wellington Channel, 

 calculated from the preceding Table. 



No. 2. 



No. 7. 



Sesquioxide of iron and phosphate 

 Carbonate of lime - - - _ - 

 Sulphate of lime - - - _ _ 

 Chloride of calcium - _ . _ 

 Carbonate of magnesia - - _ - 

 Sulphate of magnesia - . . - 

 Chloride of magnesium - - - _ 

 Bromide of magnesium . - _ _ 

 Sulphate of potash =.---. 

 Chloride of sodium - _ . _ 



•010 

 •048 

 2^711 

 •283 

 -232 



■ 1-353 



•854 

 27^621 



•022 



•091 



1^149 



•171 

 1^380 



•097 



•965 

 28^916 





33^112 



32^791 



Specific gravity 



1-026 



1^027 



A comparison of the results of the analysis of the floe-ice water 

 with that from the Straits of Dover, analysed by Professor Guthrie, 

 shows that the amount of solid residue after evaporation of the 

 Dover water is nearly the same in amount as from the upper 

 6 inches of floe-ice in Wellington Channel. 



In May 1854 experiments were made to ascertain the pro- 

 tecting power of snow from cold. Thermometers at 32° F. were 

 inserted horizontally into holes close to the floe in 4 feet of snow 

 and 3 feet above it at a depth of 1 foot from the top of the 

 snow bank. After 10 days that at the bottom of the bank in 

 contact with the ice indicated, + 14° ; the other indicated -{- 2° ; 

 while the external temperature had been — 19°, and the mean + 2^5°, 

 so that one foot of snow was equivalent to an increase of tempera- 

 ture of 21° and four feet of snow to 33° F. After 10 days more, 

 at one foot deep, the temperature was + 8°, and at four feet deep it 

 was 16°; the minimum had been —11°, and the mean -f- 11-19°. 



