ON SEA-WATER IN THE DIFFERENT PARTS OF THE OCEAN. 
235 
plete, but only chlorine and sulphuric acid were determined, which gives at 64° 30' N. 
lat. and 26° 24' W. long., 
for the surface, 
19-616 chlorine, which with a coefficient 1-812 is =35-544 salt; 
for a depth of 1020 feet, 
19-504 chlorine, which with a coefficient 1-812 is =35-341 salt. 
The next analysis of water from 62° 47' N. lat. and 37° 31'-5 W. long., gave 
for the surface, 
19-491 chlorine =35*318 per 1000 salt; 
for a depth of 1200 feet, 
19-466 chlorine =35-272 per 1000 salt. 
Further to the S.W., near the bank of Newfoundland, specimens taken by Captain 
von Dockum gave, 
for the surface, 
36-360 per 1000 salt; 
for a depth of 240 feet, 
36-598 per 1000 salt, 
which is an increasing quantity of salt for the deep water, and coincides with other 
observations which show that this curious decreasing of the quantity of salt, with the 
increasing depth, belongs only to the deep part of the Atlantic far from the shores. On 
the European side of that ocean three samples, taken by Captain Schulz at 47° 15' N. 
lat. and 9° 30' W. long., gave the following quantities of salt; — 
from the surface, 
35-922 per 1000; 
from a depth of 390 feet, 
35-925 per 1000 ; 
from a depth of 510 feet, 
36"033 per 1000 ; 
thus showing a trifling increase of salt with the depth. 
The most complete set of experiments showing this influence of the shores, I have 
made on twelve samples taken by the ‘Porcupine’ in 1862, which I owe to the 
obliging kindness of Rear-Admiral FitzRoy. The samples are taken between 50° 56' 
and 55° 22' N. lat., and 12° 6' and 15° 59' W. long., about four degrees to eight degrees 
of longitude to the west of Ireland, and five of them were from the surface, while seven 
were from deep water, between 1200 and 10,500 feet. 
The mean of the five surface observations 
Chlorine. Sulphuric acid. Lime. 
is — 
Potash. 
Magnesia. 
All salts. 
19-662 2-342 0-566 
0-367 
2-205 
35-613. 
The mean of the seven observations from the deep 
sea is — 
Chlorine. Sulphuric acid. Lime. 
Potash. 
Magnesia. 
All salts. 
19-677 2-357 0-583 
0-363 
2-193 
35-687 
2 K 
MDCCCLXV. 
