Dr Marcet’s Experiments on Sea-Water, 357 
Mr Gordon of Clunie, he entrusted them to Dr Marcet, 
whom he knew to have been engaged in similar researches 
These eminent chemists embraced every opportunity of collect- 
ing sea- water from different parts of the world ; and though 
the melancholy death of Mr Tennant interrupted for a consi- 
derable time the researches of his friend, he was induced to re- 
sume his labours after the return of the Arctic Expedition, 
which furnished him with numerous. specimens of water from 
the Polar Seas. 
Having procured above seventy different kinds of sea-water 
from different parts of the world, a great number of which were 
raised by an ingenious apparatus, invented by himself, Dr Mar- 
cet began his investigation of their physical properties, and their 
chemical composition. 
The specific gravities were measured in the usual manner, by 
comparison with equal bulks of distilled water of the same tem- 
perature. As the results would occupy top much room, we 
have arranged them in the following' table in groups, and given 
the extremes, as well as the mean, of the different results. 
Places where the 
Number 
Water was ob- 
of Speci- 
Intervals of 
Intervals of 
tained. 
mens. 
Latitude. 
Longitude. 
66° 
50' 
11° 
15' E. 
Arctic Ocean, 
12. \ 
to 
to 
80 
29 
76 
46 W. 
Northern Hemi- ) 
15. I 
3 
28 
89 
0 E. 
sphere, j 
63 
49 
55 
38 W. 
Equator, 
4. 
0 
92 
25 
0 E. 
30 W. 
Southern Hemi- ) 
10. { 
8 
30 
73 
0 E. 
sphere, / 
35 
33 
56 
0 W. 
Yellov/ Sea, 
1. 
35 
ON. 
Mediterranean, 
3. 
36 
ON. 
5 
0 w.j 
Sea of Marmora, 
M 
40 
5N. 
26 
12 E. 
41 
0 N. 
29 
OE. 
Black Sea, 
2. 
- { 
White Sea, 
2. 
65 
15N. 
39 
19 E. 1 
0 E. 
Baltic, 
3. 1 
56 
ON. 
15 
57 
39 N. 
12 
40 E. 
Ice-sea waters. 
6. 1 
75 
40 
13 
40 E. 
80 
28 
65 
32 W. 
Lake of Ourmia, 
1. 
Extremes of 
Specific 
Gravity. 
Mean of all 
the Results. 
1.02555) 
to V 
1.02727) 
1.02648 I 
1.0309 I 
1.02692 ) 
1.02825 [ 
1.02545 1 
1.03209 r 
1.02291 
1.0273 ) 
1.0305 I 
1.01328) 
1.02819/ 
1.01414/ 
1.01422 j 
1.01894 1 
1.01909 I 
1.0049t / 
1.02593 / 
1.00000 1 
1.00235 j 
1.16507 
1.02664 
1.02829 
1,02777 
1.02882 
1.0293 
1.01915 
1.01418 
1.01901 
1.01523 
1.00057 
See Phil. Trans. 1807, part ii. 296. 
•j* From Carlsham Harbour. 
