[56] Home Nature-Study Course, Vol. IV, No. 32, May, 1903.
[57] Home Nature-Study Course, Vol. V, No. 1, October, 1903.
[58] Extracted from an article by L. H. Bailey in Country Life in America, July, 1903.
[59] Home Nature-Study Course, Vol. V, No. 4, January, 1904.
[60] Silage is often put up when the corn is more mature, and then the water content is less than here given.
[61] Included with nitrogen-free extract.
[62] Home Nature-Study Course, Vol. IV, No. 29, February, 1903.
[63] Home Nature-Study Course, Vol. IV, No. 20, February, 1902.
[64] Home Nature-Study Course, Vol. V, No. 2, November, 1903.
[65] Home Nature-Study Course, Vol. V, No. 5, February, 1904.