6 
TABLE II. 
ANALYSIS OF CALNE OBSERVATIONS, 
Elevation. 
Decrease 
per cent. 
Between ground-level and 6in. 
„ 6in. „ 1ft. 
ground-level „ 1ft. 
3-3 
i-5 
4:8 
TABLE III. 
ANALYSIS OF ROTHERHAM OBSERVATIONS. 
Elevation, 
Decrease 
per cent. 
Between 1ft. and 5ft. 
6-0 
» ^ ?> >> 10 ,, 
4-4 
,, 10 „ 15 „ 
1-4 
„ 15 „ ,; 20 „ 
1-1 
„ 20 „ j, 25 „ 
0-9 
It is scarcely possible to conceive a more striking confirmation of theory 
than is furnished by the above tables. It will be seen that the decrease per 
cent, in the first six inches from the ground was more than double the 
decrease in the second six inches, that the total decrease per cent, in the 
first foot was greater than the decrease in the second five feet, and that the 
decrease per cent, between 20 and 25 feet was little more than a fourth part 
of that in the first six inches. 
Another test that may be applied has reference to the law already 
referred to, that the difference due to elevation varies with the obliquity of 
the rain. To say that the elevation- difference varies with the obliquity of 
the rain is tantamount to saying that it varies with the force of the wind. 
Now, a little consideration will show that this is exactly what ought to 
happen on the theory proposed. By the process of condensation which I 
have assumed, the air will be continually parting with its vapour, and 
unless it be as constantly renewed the process must speedily cease. Actually, 
however, fresh volumes of damp air are continually coming up to take the 
place of those which have been drained of their superfluous moisture, and 
in proportion to the rapidity with which this substitution goes on— that is. 
