203 
Dr. Marcet on the specific gravity and temperature 
Table V. Presenting a Synthetic View of the results obtained from the Analysis of different Seas ; the 
quantity of water operated upon being in every instance supposed to be 500 grains. 
i Description 
of 
( the Specimens. 
Specific 
Gravity. 
Residue 
of Eva- 
poration 
of 500 
grains 
of water. 
Muriate 
of 
Silver. 
Sulphate 
of 
Barytes. 
Oxalate 
of 
Lime. 
Phosphate 
of 
Magnesia. 
| Total of 
> Precipitates, 
from 500 grs. 
1 0 t water. 
Observations. 
[ Arctic Ocean. 
Spec. i. 
IO27.27 
Grains. 
19.5 
Grains. 
397 
Grains. 
3-3 
Grains. 
0.85 
Grains. 
V 
Grains. 
46.55 
The quantity actually operated upon was 500 grains, 
Arctic Ocean. 
Spec. 12. 
IO29.7 
14.I5 
27.9 
2 -4 
°7 
1.8 
32.8 
“ 
From surface. Quantity operated upon 500 grs. 
Arctic Ocean. 
Spec. 67. 
IO02.35 
I.75 
3 ' 2 
0. 1 
0.05 
0.03 
3-37 
Sea ice water; Coast of Spitzbergen. Operated on 
500 grains. 
Arctic Ocean. 
Spec. 14. 
IO27.05 
* 9-3 
38-9 
3- 2 5 
0.95 
2.9 
46. 
From a depth. Operated on 500 grs. 
Equator. 
Spec. 35. 
1027.85 
19.6 
4°-3 
3-7 
0.9 
3 -i 
48. 
From surface. Operated on 500 grs. 
South Atlantic. 
Spec. 41. 
1028. 19 
206 
40.4 
375 
1.0 
3 - 2 
4 8 -3 
Operated on 250 grs. 
White Sea. 
Spec. 58 and 59. 
IO22.55 
16. 1 
31.8 
3 -° 
c.6 
2.2 
37-6 
Operated on 500 grs. but evaporated only 250 grs. 
Black Sea. 
Spec. 56 and 57. 
IOI4.22 
10.8 
19.6 
1.95 
0.55 
'•5 
23.6 
Operated upon 500 grs. for the earths ; but upon only 
250 for muriate of silver and evaporation of thewat*r. 
Baltic. 
Spec. 60. 
1004.9 
3-3 
7 - 
07 
0.2 
0.6 
8.5 
Operated upon 250 grains. All the precipitates were 
slightly tinged by some vegetable or animal matter. 
Sea of Marmora 
Surface. 
Spec. 53. 
IOzO.28 
14. 1 1 
28.4 
2.65 
0.4 
2 -3 5 
33-8 
Entrance of Hellespont. Surface. Operated on 500 
grs., except for muriate of silver. 
Sea of Marmora* 
Bottom. 
Spec. 52. 
1028. 19 
21. 
40.4 
3 55 
0.9 
3. 2 
48.05 
From the bottom. A little carbonate of lime was 
deposited during evaporation ; but none from the water 
at the surface. Operated on 500 grs. 
Middle of 
North Atlantic. 
Spec. 27. 
1028.86 
21.3 
42. 
3-85 
0.8 
2.7 
49-35 
Operated on 250 grs. for evaporation of the water and 
precipitation of muriate of silver. 500 for the othei salts. 
Y ellow Sea. 
Spec. 48. 
1022.9 I 
16. 1 
3 2 -9 
'•35 
°75 
2.2 
3 7 - 2 
During concentration deposited carbonate of lime. 
(See note, p. 195.) The water was yellowish, and had an 
exceedingly strong hepatic smell. Proportion of magnesia 
rather smaller than common. Operated on 500 grs. 
Mediterranean. 
Spec. 51. 
1027.3 
1 9 7 
38 5 
3 - 6 
0.8 
3 -° 
45-9 
From Marseilles, and therefore rather weak, from the 
vicinity of rivers. Operated on 100 grs. for evaporation 
and muriate of silver ; and 250 for the other salts. 
Dead Sea. 
I - _ 
1211. 
192.5 
326.4 
0.5 
9 7 8 
55 -5 
584.68 
Philosophical Transactions, 1807. i 
! Lake Ourmia, 
! in Persia. 
1 165.07 
1 1 1 .5 
2 37-5 
66.0 
O. 
10.5 
425.5 
Specimen brought by the traveller Brown. Ope- 
rated on ico, and 50 grs. 
General Observations. 
In the above experiments* the residues were dried as follows, viz. The residue obtained from the water by evaporation, was 
thoroughly dried at a boiling heat in a water-bath, till it entirely ceased to lose weight. The muriate of silver was heated to incipient 
fusion ; the sulphate of barytes and oxalate of lime were dried at a boiling heat; and the ammoniaco-phosphate of magnesia, was 
neated to redness. No filters were used. The precipitates were washed, dried, and weighed, in the same glass capsules in which 
they were formed, with the exception of the magnesian salt, which was heated to redness by means of the blow-pipe, in a very 
thin and small pl^tina crucible. 
