52. Same as reference JTo. 1. page 5. 



53. B.P.I.Bul. 78, p. 33 



54. Bui. 113, Kentucky Expt . Stn. 

 F5. B.P.I. 78, p. 34. 



56. Bui 104, Uebr, Expt. Stn. p. 34 



57. Bui. 231, Ohio Expt. Stn. p. 11. 

 58. 



59. Bui. 21, Mo. Sxpt. Stn. 



60. Bui. 128, So. Dak. Expt. Stn. 



61. Bui 33, Kan. Sxpt. Stn. p. 14. 



62. Agricultural .Engineering "by Davidson, p. 281 on. 



63. Bui 115, 1,'inn. Agr. Expt. Stn. p. 369. Kept. 1908-1909. 



64. 7th Ann. P.ept. Amer. Soo. Agr. Engineers, p. 57. 



65. Sante ae ref. So 1. pp. 50, 52, 53. 



