OF SEA-WATER IN THE DIFFERENT PARTS OF THE OCEAN. 
225 
quantity of sulphuric acid than the normal, and the samples from the eastern part of the 
region nearer to the African coast have a proportion of sulphuric acid which is con- 
siderably greater than the normal quantity. Does this depend upon the more prevailing 
volcanic character of the west coast of Africa compared to the east coast of America \ 
Thirteenth Region. The sea between Africa and the East Indian Islands. — The mean 
of this region is 33-868, but it is deduced from observations that have given very different 
results. The maximum (35’802) is from 31-54 S. lat., 72° 37' E. long., about midway 
between the Cape of Good Hope and Australia. Now in the North Atlantic Ocean 
even the mean salinity between 30° and 55° N. lat. is 35-932, thus greater than the 
maximum in this region, though this maximum is from near 32° S. lat. The fact is 
striking. The minimum (25-879) is from a place high up in the Bay of Bengal, and of 
course highly influenced by the vast quantity of water from the Ganges. It lies, how- 
ever, about 300 English miles from the mouth of the Ganges ; and another specimen 
from N. lat. 17° 20', and about sixty miles nearer the mouth of the Ganges, has 32-365 
per 1000 salt, so that it seems as if some other cause has also been operating to weaken 
the sea-water at the minimum place. 
Fourteenth Region. The sea between the south-east coast of Asia , the East Indian 
Islands , and the Aleutic Islands. — The mean quantity of salt, deduced from seven com- 
plete analyses, is 33-506, the maximum from a place to the south-east of Japan, in 
38° 31' N. lat., is only 34*234, less than the maximum of the German Ocean between 
50° 60' N. lat., and surrounded by land (35-041). The minimum (32-370) between the 
larger East Indian Islands depends evidently upon the influence of the surrounding land. 
The mean proportion of chlorine, suphuric acid, lime, magnesia, isl00:ll - 76: 3-05:10-99, 
very nearly normal. The mean coefficient is 1-815. 
Fifteenth Region. The sea between the Aleutic Islands and the Society Islands , between 
38° N. lat. and 32° S. lat. — The mean quantity of salt is only 35-219, which is very 
near the mean of the East Greenland current (35-278), and very much below the mean 
of the Atlantic between 30° S. and 30° N. lat., which is 36-321. Its maximum is 36-061 
near Borabora, about 16° S. lat., while the maximum of the corresponding tropical part 
of the Atlantic is 37-908 ; its minimum, under 38° 26' N. lat., very far from any land, is 
34-157. The mean proportion of chlorine, sulphuric acid, lime, and magnesia is 
100 : 11-67 : 2-93 : 11-06. The mean coefficient is 1-806. 
Sixteenth Region. The Patagonian cold-water current. — Mean 33-966 per 1000, maxi- 
mum 34-152, minimum 33-788. The minimum is in the southernmost part of this current, 
and the maximum under 35° 22' S. lat. The mean proportion of chlorine, sulphuric acid, 
lime, and magnesia is 100 : 11-78 : 2'88 : 11-04. The mean coefficient is 1-806. 
Seventeenth Region. The South Polar Sea. — I have only three analyses, all on 
samples taken by the late Sir James Ross. One was from 77° 32' S. lat., 188° 21' E. 
long., close to the great ice-barrier. The water was full of animalculae, but, notwith- 
standing, had not fermented. The quantity of salt which it contained was 28-565 per 
1000. The next sample was from 74° 15' S. lat., 167° E. long. ; the water was muddy, 
