and the Distribution of Heal over ike Globe, 265 
parts of the isothermal lines. At Port Jackson, where the ther- 
mometer descends sometimes below the freezing point, the warm- 
est month is 77°.4, and the coldest 56°.8. We find here the 
summer of Marseilles and the winter of Cairo In Louisiana 
2 1 of Lat. nearer the Equator, the warmest month is 79°. 7, 
and the coldest 46°. 9- In Van Diemen’s Land, corresponding 
nearly in latittide to Rome, the winters are more mild than at 
Naples; but the coldness of the summers* *(• is such, that the 
mean temperature of the month of February appears to be 
scarcely 64°. 4, or 66°.2, whilst at Paris, under a latitude more 
distant from the Equator by 7°, the mean temperature of the 
month of August is also from 64°. 4 to 66°. 2', and at Rome 
above 77°. Under the parallel of 51° 25' south, the mean 
temperature of the Malouine Isles is well ascertained to be 47°. 3. 
At the same Lat. N. we find the mean temperature in Eu- 
rope from 50° to 51°. 8, and in America scarcely from 35°. 6 
to 37°. 4. The warmest and the coldest months are at London 
66°.2 and 35°. 6; at the Malouine Isles 55°. 8 and 37°.4. 
At Quebec, the mean temperature of the water is 14° ; at the 
Malouine Isles 39°. 6, though those isles are 4° of Lat. farther 
from the Equator than Quebec. These numerical ratios prove, 
that, to the parallels of 40° and 50°, the corresponding isother^ 
mal /lines are almost equally distant from the Pole in the two 
hemispheres ; and that, in considering only the system of trans- 
atlantic climates between 70° and 80° of W. Long., the mean 
temperatures of the year, under the corresponding geographical 
parallels, are even greater in the southern than in the northern 
hemisphere. 
The division of the heat between the different parts of the 
year, gives a particular character to southern climates. In the 
Latitude. Mean Temp. 
• Cairo, 30® 2 ' ' 72®.3 
Funchal, 32 37 68 5 
Algiers, 36 48 70 0 
•f* In Van Diemen’s Land the thermometer descends in February, in the morn- 
ing, to 45®.5. The mean of mid-day is 60*.8. At Paris it is in August 73®. 4. 
In Van Diemen’s Land, in February the mean of the maxima is 78°8. ; of the 
minima 54».5. At Rome these means are 86® and 64°.5. — D’Entrecasteaux, 
Foyflge, tom. i. p. 205. and 542. 
