ce of the over-heated
plains, and from November to March inclusive from the north-east, in
obedience to the trade-wind force."

What the "trade-wind force" is, Lieutenant Maury tells us in another
paragraph, viz.: "Calorific action of the sun and diurnal rotation of the
earth"--the received calorific theory. I have already shown, I think,
conclusively, that there is no expansion and ascent in the supposed region
of calms, which induces, or can induce, the trades; and that, in point of
fact, the air on the land is cooler under the belt of rains. But as
Lieutenant Maury, whose reputation is national, adopts the theory, I shall
be pardoned for copying the following table, showing the difference of
temperature at two cities of India, before, after, and while the belt of
inter-tropical rains is over them. It will be seen that the temperature is
actually less when the belt is there, viz., in July and August, than in
April and May. _This should be conclusive upon that point._

+----------------------------------------------------+
| | Anjarakandy. | Calcutta. |
| Months. |--------------------|-------------------|
| | Rain. | Temp. | Rain. | Temp. |
|-----------|----------|---------|---------|---------|
| | M. M. | | M. M.| |
| January, | 2,26 | 26 deg.,5 | 0,0 | 18 deg.,4 |
| February, | 2,26 | 27 deg.,7 | 67,68 | 21 deg.,5 |
| March, | 6,77 | 28 deg.,4 | 24,82 | 25 deg.,6 |
| April, | 29,33 | 29 deg.,8 | 130,84 | 28 deg.,5 |
| May, | 175,96 | 28 deg.,6 | 16,24 | 29 deg.,7 |
| June, | 794,05 | 26 deg.,6 | 575,24 | 29 deg.,3 |
| July, | 807,59 | 25 deg.,8 | 338,38 | 28, deg.1 |
| August, | 572,98 | 26 deg.,0 | 311,31 | 28 deg.,3 |
| September,| 311,31 | 26 deg.,4 | 254,91 | 28 deg.,0 |
| October, | 157,91 | 26 deg.,8 | 42,86 | 27 deg.,2 |
| November, | 65,42 | 26 deg.,9 | 20,30 | 23 deg.,0 |
| December, | 29,33 | 26 deg.,5 | 0,0 | 19 deg.,2 |
|-----------|----------|---------|---------|---------|
| Year, | 2955,14 | 27 deg.,2 | 1928,74 | 26 deg.,4 |
+----------------------------------------------------+

Anjarakandy is on the Malabar coast, between 12 deg. and 13 deg. north latitude.
Calcutta in an angle of the Bay of Bengal, at 22 deg. 30' north latitude. The
for