312 Practical Experiments on the Air-drainage of Land. 
uninterruptedly dry weather, by no means flourishing ; yet it was 
pecuharly gratifying to find the turnips on the air-drained land 
certainly one-half superior to those on the remainder of the field. 
Very soon after this latter date frequent and copious falls of 
rain ensued, and in consequence the turnips on the non-air- 
drained land improved proportionately more than those on the 
air-drained, showing that tlie damp air at nights, &c. &c., had all 
along supplied moisture to the latter to a considerable extent. 
As wheat seed-lime approached the whole field of turnips 
was condemned as being too inferior to stand through the 
winter: therefore, it was at once determined to clear the ground 
and sow wheal, which, in each successive stage towards maturity, 
clearly showed, as in the case of the turnips and numerous other 
experiments under observation, most prosperous on the air-drained 
land. 
In order to test the accuracy of our observations, the produce 
of the turnips and the wheat, in portions of nearly an acre in 
each of the several divisions, was carefully weighed, the result 
being as follows, viz. : — 
DESCRIPTION. 
Produce per Imperial Acre. 
Turnips. 
Wheat. 
Wheat 
Straw. 
Skirvings. 
Pine-ap. 
Weight. 
Measure. 
Air-drained Land, — two sorts of turnips ") 
drawn nlf\ succeeded by wheat ... 5 
Non Air-drained Land, — ditto ditto. . . 
Difference per Imperial Acre in favour ) 
The result of another experiment proved 
asfollnu'Sy viz : — 
Air-drained Land, — Potatoes plomjhedl 
Non-Air-drained Land, — ditto ditto, . . 
Difference per Imperial Acre in favour) 
tons cwt. 
16 4 
13 12 
tons cwt. 
10 8 
6 16 
St. lbs. 
129 4 
94 4 
bush. pks. 
28 3 
21 0 
cwt. qrs. lbs. 
27 2 20 
20 2 24 
2 12 
3 12 
35 0 
7 3 
6 3 24 
158 8 
134 4 
35 0 
29 3 
35 3 16 
30 0 10 
24 4 
5 1 
5 3 6 
The quality of the wheat on the air-drained land was, in addition, 
judged to be superior by 2>d. per bushel; and the straw of a 
brighter and better description. 
The general produce, 1 am very confident, would have been 
much larger had the drains been deeper. 
Mr. Stafford informs me (what I constantly witness myself in 
other cases) that, during windy or breezy weather, a draught of 
air through the drains is always perceptible at the outlets ; and 
at other times,- after water has ceased to be discharged, a hazy 
evaporation is frequently visible. 
The conclusion to which my mind has been brought by this 
