[151] Heiden's 'Düngerlehre,' vol. ii. pp. 34, 66. In Boussingault's experiments the food consisted of 15 lb. hay, 4.54 lb. oats, and 32 lb. water; the total excrements amounting to 31.16 lb., containing 7.42 lb. dry matter. In Hofmeister's experiments the food consisted of 5.23 lb. hay, 6.18 lb. oats, 1 lb. chopped straw, and 25.57 lb. water; the excrements amounting to 25.07 lb., containing 5.32 lb. dry matter.
[152] This is taking no account of the amount of water which the manure will absorb, and which will probably double the quantity.
[153] See Appendix, Note IX., p. 283.
[154] The rapid fermentation of horse-manure is due to its mechanical as well as its chemical nature. The horse does not reduce its food to such small pieces, and its urine is rich in nitrogen.
[155] Schulze recommends one-third of a pound per day of sulphate of lime for each horse.
[156] See Appendix, Note X., p. 284.
[157] The food consisted of 30 lb. potatoes, 15 lb. hay, and 120 lb. water.
[158] For further analyses of cow-manure, see Appendix, Note XI., p. 286.
[159] This is for a pig of six to eight months old, and fed on potatoes.
[160] It has been asserted that the use of pig-manure, when applied alone, is apt to give an unpleasant taste to the produce grown.