[24] Ibid. 233:80. 1912.

[25] U. S. D. A. Bu. of Pl. Ind. Bul. 242:27. 1912.

[26] Ibid.

[27] Ibid. 207:62. 1911.

[28] Ibid. 233:76. 1912.

[29] Ibid. 233:78. 1912.

[30] Ibid.

[31] Ibid.

[32] Ibid. 106:26. 1907.

[33] Ibid. 132:80. 1908.