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56. Journal Royal Agricultural Society, Eng. , (1900), p. 468. 



57. Schuppan. Molk. Zeit. 7, (1893), p. 241. Cent. f. Bakt., XIII., (1893) p. 155. 



58. Backhaus. Milch Zeit. (1897), p. 357. 



59. Dunbar and Kister. Milch Zeit. (1899), p. 753,787. 



60. Popp and Becker. Hyg. Rundsch., 3 (1893), pp. 530-534. 



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64. Niederstadt. Chem. Centbl. I (1S93), p. 396. 



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66. Marshall. Michigan .Agricultural Experimental Station, Bulletin 182, 1900. 



67. Pearson. Seventeenth Report Bur. An. Ind., Washington, D.C. (1900), p. 191. 



68. Sedgwick. Principles of Sanitary Science, N.Y., 1902. 



Note. — I desire to acknowledge the courtesy of Mrs. Massey, Dentonia, for the use 

 of Figs. 16 and 17 ; Major Alvord, of the United States Department of Agriculture, for 

 Fig. 6 ; The City Dairy Co. for Fig. 1 1 ; The Kjobenhavn Maelkforsyning for Figs. 9 

 and 10. 



