40 REPORT—1845. 
latively high temperatures. I found on this occasion the isothermal points to 
be as follows:— 
Longitude | Mean temperature | Mean temperature | Distance of both 
5? 
east of Paris. 9°°267 700. isothermal lines. 
50 47°82 lat. 60°32 lat. 12:5 
925°0 A5'DZS ass — «. — 
30°0 — 53°30 ... 8°9 
35°0 A3Z°51 ... — see = 
127:0 A041 ... 45°51... 5°] 
228°0 — se 57°40 ... 18°9 
933°7 38°56 ... por st — 
263°0 41°16... — .. — 
985:0 40°45 ... 43°95 ... 3°5 
This remarkable want of parallelism of the isothermal lines of 9°-267 and of 
5°70, is confirmed in a surprising manner by the results obtained at Toronto. 
In 43°659 lat. 
In 280°°642 east of Paris, the mean temperature is = + 5°489 R. 
At 320°74 Paris feet elevation, 
or reduced to the level of the sea = + 57934 R. 
The above statements relative to the meridian of 285° east of Paris are 
founded on the following equation derived from former observations (p being 
the latitude, 7 the longitude east of Paris, both in degrees) :— 
Mean temperature at the oceanic level = 9°267 — (p — 40°45) 1°16 
— (1 — 285°00) 0°10, 
which gives for the point of the sea’s level, lying vertically under Toronto, 
..- + 5%969 R mean temperature; 7.e. a result differing only by 0°035 R 
from the one observed. From this it appears evident that it is well worth 
while to take the laws of these phenomena into serious consideration. 
Again, from the values observed at Toronto, viz.— 
Pressure of the whole atmosphere = 333!""223 Parisian, ) WwW 
Pressure of aqueous vapour a= ONO14 
Results for the sea’s level in the same latitude: 
Pressure of the whole atmosphere = 337!'"474 
Press. of aqueous vapour (about) = = 3!""0 
From my three years’ observations at sea, I concluded* the following mean 
annual values :— 
ithout correec- 
tion for differen- 
ces in the inten- 
sity of gravity. 
Pacific Ocean. Atlantic Ocean. 
Latitude. | Pressure of | Pressure of | Pressure of | Pressure of 
the whole | aqueous va- | the whole | aqueous va- 
atmosphere. pour. atmosphere. pour. 
40 ‘| 38710 | 4-25 33959 | 5:53) 3 
45 33646 3°62 33810 | 426 | 5 
ES | | | > 
43 39 336°62 3°78 | 338°50 4°61) 
i ! 
* For calculating, as at Toronto, by the heights of mercury in the barometer, corrected 
only for temperature (viz. reduced to 0° R.) but not for differences in the intensity of gravity. 
