Agricultural Meteorology. 
3-21 
The observed thonnomctrical state of the atmosphere in the 
metropolitan counties of England will not- confirm M. Gasparin's 
livpothesis, without some considerable modifications, as further 
experience and more numerous ol)servations mav present. Our 
temperatures for the months during which the corn is advancing 
range as follows : — 
Falir. 
April . . 40 -9 
May . . 51 "5 
•Tune . . 58- 2 
July . . 61 -S 
August . 61 '8 
Cent. 
Pays, 
o 
5-3 
X 
30 
12-5 
X 
31 
14-6 
X 
30 
17 
X 
31 
17 
X 
15 
Total 
Degrees 
= 159 
= 389 
= 438 
= 528 
= 255 
There remains the complement of purely solar heat to be 
added. The late Professor DanicU's Meteorological Essays con- 
tain an account of his observations during the years 1S21 and 
1822 of the excess of solar over atmospheric heat. The mean 
was as follows : — 
Fahr. 
Cent. 
o 
o 
April 
. 28 
= 15-5 
Mivy . . 
. 30-5 
= lf)-9 
.Tune . . 
. 39-9 
= 22-1 
July . . 
. 25-8 
= 14-2 
August . 
. 33-1 
= lS-4 
If we halve the respective differences in the manner practised 
by M. Gasparin, and multiply them into the days in each month, 
there will be : — 
April . 
15-5 
o 
7' 
•5 
X 
Days. 
30 = 
o 
225 
May . 
lG-9 
• ~2~ ^ 
8' 
•4 
X 
31 =r 
2G0-4 
June . 
22-1 
• ~ 
11 
X 
30 = 
330 
July . 
14-2 
2~ ~ 
7 
•1 
X 
31 = 
220 ■ 1 
August 
18-4 
' '4, ~ 
9' 
. ■? 
X 
15 = 
138 
1173-5 
This sum of 1173'5 of solar degrees, added to 1767° atmos- 
pheric, obtained from the table above, makes 2940° — a greater 
amount than M. Gasparin obtains for either Orange or Paris. 
In the arctic regions the difference of solar heat is far greater 
than in the temperate, and in the temperate than in the torrid 
zone. In the latter Humboldt never found it exceed 6 -6 Fahr.; 
but some of Mr. Daniell's observations in the neighbourhood of 
