60 
III. On the Amount of Carbon Dioxide in the Air of Sea 
Coast Places . 
Thorpe (Chem. Soc. J. [2] y. 189) has shown that the air 
over the ocean contains less carbon dioxide than air over 
the land, the mean numbers being S'O and 4 ‘04 vols. per 
10,000 of air respectively. 
During the long vacation I interested myself with a few 
experiments upon the air of the sea coast with a view to 
determine whether it inclined, as regards carbon dioxide, to 
sea air or to land air. 
The samples of air were collected at A rdrossan , a small 
town on the firth of Clyde, where the liver is almost entirely 
merged in the open sea. 
The estimations were conducted in accordance with Pet- 
tenkofer s method. 
1 
Date, 
1875. 
Weather. 
Place and Time. Temp. 
| 
Barom. 
Wind. 
Vols. of 
CO 2 per 
10,000 of 
air. 
Aug 2. 
Fine but cloudy. 
In boat, i mile 
from shore ; 12 
noon. 
16'-5 
707mm. 
Why S 
3-87 
4 
J5 
Clear, cloudless 
sky. Sunset. 
On shore, 8 p.m. 
21° 
700mm. 
W byN 
3-88 
14 
,, 
Fine, fresh breeze 
200 yards from 
shore, 3 p.m. 
21° 
700mm. 
SW 
3-34 
CD 
rH 
Fine, very clear ; 
very heavy rain 
during preced- 
ing night. 
On shore, 8.30 
a.m. 
10 a 
759mm. 
NW 
3-40 
» 21. 
Fine, very clear ; 
rain during 
morning. 
In boat, i mile 
from shore, 2. 30 
p.m. 
IK,*' 
1/ O 
707mm. 
NW 
3'84 | 
Sept. 3. 
Fine, showers 
during preced- 
ing da 7 fs. 
300 yards from 
shore. 
16° 
759mm. 
NW 
4-01 ! 
1 
Mean=3'72 vols. CO -2 per 10,000 of air. 
The air of such a place as Ardrossan, although it be situ- 
ated almost in the open sea, is not therefore influenced by 
the sea, so far as the carbon dioxide is concerned, but con- 
tains almost the same amount of that gas as is found in land 
air. 
