NOTE XVI. (p. 270).

AMOUNTS OF POTASH AND PHOSPHORIC ACID REMOVED BY THE FOLLOWING
ROTATIONS FROM A PRUSSIAN MORGEN (.631 ACRE).

Potash. Phosphoric acid.
lb. lb.
1. Wheat 16.40 10.67
Oats 10.47 4.59
Potatoes 66.41 18.33
Hay 39.54 11.32
------ -----
132.82 44.91
------ -----
The ratio of potash to phosphoric acid is 2.96 to 1.

2. Wheat 16.90 10.67
Barley 17.44 10.65
Potatoes 66.41 18.33
Hay 39.54 11.32
------ -----
140.29 50.97
------ -----
The ratio of potash to phosphoric acid is 2.76 to 1.

3. Rye 20.03 12.15
Oats 10.97 4.59
Potatoes 66.41 18.33
Hay 39.54 11.32
------ -----
136.95 46.39
------ -----
The ratio of potash to phosphoric acid is 2.95 to 1.

4. Wheat 16.90 10.67
Oats 10.97 4.59
Mangels 148.54 25.62
Hay 39.54 11.32
------ -----
215.95 52.20
------ -----
The ratio of potash to phosphoric acid is 4.13 to 1.

5. Rye 20.03 12.15
Barley 17.44 10.65
Mangels 148.54 25.62
Hay 39.54 11.32
------ -----
225.55 59.74
The ratio of potash to phosphoric acid is 3.78 to 1.

NOTE XVII. (pp. 253, 254).

COMPOSITION OF FARMYARD MANURE (FRESH), (calculated by SIR
JOHN LAWES).

Phosphoric acid
Total dry Total mineral calculated as Potash. Nitrogen.
matter. matter. phosphate of
lime.
Percent 30.0 2.77 .50 .53 .64
Per ton (in lb.) 67.2 62.0 11.1 12.0 14.3

NOTE XVIII. (p. 232).

THE URINE.

An important consideration we have omitted to take note of in the text
is the quantity of the urine voided. It is this consideration that
renders the urine so much more valuable than the solid excr