[229] U. S. D. A. Condition of Growing Crops August. 1887.
[230] Ibid.
[231] N. Y. Farmer and Hort. Repository 9. 1831.
[232] Yoemans, John L. Rpt. of U. S. Com. of Patents 166. 1852.
[233] Conn. Bd. Agr. Rpt. 169. 1867.
[234] Ibid. 173.
[235] Trans. Mass. Hort. Soc. Pt. 1:140. 1882.
[236] Houghton Farm Exp. Dept. Ser. 3. No. 2:27. 1882.
[237] Proc. Am. Pom. Soc. 212. 1854.
[238] Rpt. U. S. Com. Patents 369. 1851.