[45] Eckles, Bull. 59, Iowa Expt. Stat., Aug. 1901.
[46] Eckles, Bull. 59, Iowa Expt. Stat., Aug. 1901.
[47] Russell, 15 Rept. Wis. Expt. Stat. 1898, p. 104.
[48] Alvord, Circ. No. 9, U. S. Dept. Agric. (Div. of Bot.).
[49] Connell, Rept. of Commissioner of Agr., Canada, 1897, part XVI, p. 15.
[50] Harrison, Hoard's Dairyman, March 4, 1898.