Eapcrimcnls with Gucuin, and other Mamircs. 213 
On Corn. — Bt/ Mr. Johling, of Newton Hall. 
18. An acre of land, cropped with oats, was top-dressed 
w ith 200 lbs. of guano, and 2 bushels of house-ashes, 
sifted, after the oats were in braird, at a cost of '60s. 
per acre. The produce in oats was . . .6.3 bushels. 
Weight of straw . . . . . .66 stones. 
The produce of 2 half-acres, on each side, which had 
no manure, was, in oats ..... 55^^ bushels. 
Weight of straw . . . . . .57 stones. 
Leaving a difference of bushels of oats, and 9 
stones of straw, in favour of the guano and ashes, 
which will not repay the cost. 
An acre of land, inferior to the former in quality, was 
treated in the same way, and produced . . 30 bushels. 
AVhile an adjoining acre, without manure, produced 24 ,, 
19. An acre of land, growing wheat, was top-dressed in the same way, 
without producing any sensible superiority over the adjoining 
crop. 
20. An acre of land had the same mixture applied to it before sowing 
the wheat in autumn, the crop upon which was considerably 
lighter than that on each side, which had received 15 single- 
horse cart-loads of common manure per acre. 
From results so vai-ying and contradictory, althou^jh no correct 
judgment can be formed as to the general applicability of guano 
to different kinds of soils and crops, some practical use may never- 
theless be derived. One thing I think may be taken as proved — 
that it is not advisable to use guano alone, or even with a very small 
mixture of ashes, or other such like substances. I was much dis- 
appointed in the result of experiments 7 and 8 ; for during all 
the early part of the season, the turnips grown on guano took the 
lead of the others, having a much larger and darker-coloured leaf, 
and covering the ground much better; and I am persuaded that 
if both plots had been weighed in the end of September, instead 
of December, the balance would have been in their favour ; but 
early in October they ceased to improve, the leaf fell, and they 
looked faded and unhealthy ; whereas those on the fold-yard 
manure began at that time to recover, in some measure, from the 
effects of the extreme heat and drought of the summer. The 
showers which fell in October, that produced no effect on those 
sown upon guano, greatly recruited those sown on fold-yard 
manure. They assumed a fresh appearance : the yellow and mil- 
dewed leaves gave place to others of new growth, and the roots 
swelled out to a size which had previously seemed hopeless. The 
crop became rather good than otherwise, for so unfavourable a 
season as it was here ; and the comparative weights show the final 
superiority of farm-yard manure over guano, upon a turnip loam 
with a sandstone basis. In watching the progress of these two 
