236 
PROFESSOR, EORCHHAMMER ON THE COMPOSITION 
Chlorine =100, the proportions are — 
Chlorine. 
Sulphuric acid. 
Lime. 
Potash. 
Magnesia. 
All salts. 
For surface . . 
. 100 
11-91 
2-88 
1-87 
11-21 
181-1 
For deep water . 
. 100 
11-98 
2-96 
1-84 
11*14 
181-4 
The difference is very trifling, and the quantities of salts increase in a very slight degree 
with the depth. 
I owe all the other samples from the North Atlantic Ocean which have been used for 
my analyses, of which I am now going to give the results, to the late Sir James Eoss, 
through the assistance of the most honourable and learned President of the Royal 
Society, General Sabine, who always is most willing to assist scientific labours with his 
powerful influence and his prudent advice, and to whose intercession I am indebted for 
several of the most interesting results I have obtained in this investigation. 
At 18° 16' N. lat. and 29° 56' W. long., 
from the surface, 
20-429 chlorine =36-833 per 1000 saltf °° e “ 
r { of water from Sir J. Ross=l*803); 
from 3609 feet, 
19-666 chlorine =35*448 per 1000 salt. 
At 16° 27' N. lat and 29° W. long., 
from the surface, 
20-186 chlorine =36-395 per 1000 salt (coefficient 1-803); 
from 900 feet, 
20-029 chlorine =36*112 per 1000 salt (coefficient 1-803); 
from 2700 feet, 
19- 602 chlorine =35-342 per 1000 salt (coefficient 1*803). 
At 15° 38' N. lat. and 28° 10' W. long. 
from the surface, 
20- 081 chlorine =36-206 per 1000 salt (coefficient 1-803) ; 
from 3360 feet, 
19-744 chlorine =35-598 per 1000 salt (coefficient 1-803). 
At 14° 18' N. lat. and 27° 15' W. long., surface observation wanting; 
from 900 feet, 
19*934 chlorine =35*941 per 1000 salt (coefficient 1*803); 
from 2700 feet, 
19- 580 chlorine =35*303 per 1000 salt (coefficient 1*803) ; 
from 3600 feet, 
19*705 chlorine =35*528 per 1000 salt (coefficient 1-803). 
At 12° 36' N. lat. and 25° 35' W. long., 
from the surface, 
20- 114 chlorine =36*195 per 1000 salt (direct observation) ; 
from 11,100 feet, 
19-517 chlorine =35*170 per 1000 salt (direct observation). 
