has given the particulars of a very careful experiment.
He tried to test the comparative value of manure kept in an open court
with that kept under cover. He selected the same kind of cattle, gave
them the same kind and quantity of food, and bedded them with the same
kind of straw. A field of 20 acres of uniform land was selected. This
having been equally divided, 2 acres out of each 10 gave the following
results:--

_Potatoes grown with Uncovered Manure._

Tons. cwt. lb.
First measurement--1 acre produced. 7 6 8
Second do. do. do. 7 18 99

_Potatoes grown with Covered Manure._

First measurement--1 acre produced. 11 17 56
Second do. do. do. 11 12 26

This shows an increase of about 4 tons of potatoes per acre with the
covered manure.

"The next year the weather was wet, grain soft and not in very good
order, but the following was the amount of produce:--

_Wheat grown with Uncovered Manure._

Weight per
Produce in grain. bushel. Produce in straw.
Acre. bushels. lb. lb. stones. lb.
First 41 19 61-1/2 152 of 22
Second 42 38 61-1/2 160 of 22

_Wheat grown with Covered Manure._

First 53 5 61 220 of 22
Second 53 47 61 210 of 22"

NOTE XV. (pp. 231, 264).

DRAININGS OF MANURE-HEAPS.

The importance of not separating the liquid portion from the solid
portion has already been pointed out in dealing with the composition of
the solid excreta and the urine. These two constituents of the manure
are complementary to one another, and the value of farmyard manure as a
general manure is very much impaired if the liquid portion is not
applied along with the solid. In one important respect do the drainings
of manure-heaps differ from urine--that is, in the percentage of
phosphates they contain, the latter being practically devoid of
phosphoric acid.

The following is an analysis of drainings from a manure-heap (Wolff):--

Dry substance 18.0 | Magnesia 0.4
Ash 10.7 | _Phosphoric acid_ 0.1
Nitrogen 1.5 | Sulphuric acid 0.7
Potash 4.9 | Silica 0.2
Lime 0.3 |