farmyard manure. This is of course
assuming for farmyard manure the value that it would fetch when sold,
or, to put it rather differently, the price it would cost if the farmer
had to purchase it. Farmyard manure is a necessary bye-product of the
farm, and can scarcely be regarded, therefore, in the same light as the
artificial manures which the farmer buys.[180]

FOOTNOTES:

[131] See Appendix, Note I., p. 279.

[132] "The large amount of potash in unwashed wool is very remarkable: a
fleece must sometimes contain more potash than the whole body of the
shorn sheep."--Warington's 'Chemistry of the Farm,' p. 78.

[133] See Appendix, Note II., p. 279.

[134] The urine of the pig, from the nature of its food, is, as a
general rule, a very poor nitrogenous manure.

[135] See Appendix, Note XV., p. 290.

[136] See Appendix, Note III., p. 280.

[137] See Appendix, Note XVIII., p. 291.

[138] The nitrogen present in the urine, it may be well to point out, is
derived from the waste of nitrogenous tissue as well as from nitrogenous
matter of the food digested.

[139] Note IV., p. 281.

[140] Warington puts this matter admirably in the following words: "If
the food is nitrogenous and easily digested, the nitrogen in the urine
will greatly preponderate. If, on the other hand, the food is one
imperfectly digested, the nitrogen in the solid excrement may form the
larger quantity. When poor hay is given to horses, the nitrogen in the
solid excrement will exceed that contained in the urine. On the other
hand, corn, cake, and roots yield a large excess of nitrogen in the
urine." ('Chemistry of the Farm,' p. 137).

[141] See p. 281.

[142] See p. 282.

[143] See Heiden's 'Duengerlehre,' vol. ii. p. 58.

[144] Heiden's 'Duengerlehre,' vol. i. p. 404.

[145] The following quantities of nitrogen are found in rye, pea, and
bean straw:--

Ranging from Average Lb.
per cent. per cent. per ton.

Rye-straw .30 to .73 .57 12.76
Pea-straw .76 to 1.61 1.21 27.10
Bean-straw 1.15 to 2.62 1.92 43.00

[146] Dr J. M. H. Munro recommends the sprinkling of a little finely
sifted peat-powder in addition to straw, as an excellent means of
preventing loss of volatile ammonia in the fermentation of manure.

[147] See 'Mark Lane Express,' October 7, 1889, p. 475.

[148] See Appendix, Note VII., p. 283.

[149] For analyses