[14] Burr, R. H. Cent. f. Bakt., II Abt., 8: 236, 1902. Freudenreich, l. c. p. 418. Ward, Bull. 178, Cornell Expt. Stat., p. 277. Bolley (Cent. f. Bakt., II Abt., 1: 795, 1895), in 30 experiments found 12 out of 16 species to belong to lactic class. Harrison (Trans. Can. Inst., 7: 474, 1902-3) records the lactic type as most commonly present. [15] Ford, Journ. of Hyg., 1901, 1: 277. [16] Freudenreich, l. c. p. 421. [17] Stocking, Bull. 42, Storrs Expt. Stat., June, 1906. [18] Dinwiddie, Bull, 45 Ark. Expt. Stat., p. 57. Ward, Journ. Appld. Mic. 1: 205, 1898. Appel, Milch Zeit., No. 17, 1900. Harrison and Cumming, Journ. Appld. Mic. 5: 2087. Russell and Hastings, 21 Rept. Wis. Expt. Stat., 158, 1904. [19] Fokker, Zeit. f. Hyg., 9: 41, 1890. [20] Freudenreich, Ann. de Microg., 3: 118, 1891. [21] Hunziker, Bull. 197, Cornell Expt. Stat., Dec. 1901. [22] Freudenreich, Cent. f. Bakt., II Abt., 10: 417, 1903. [23] This general statement is in the main correct, although Ford (Journ. of Hyg., 1: 277, 1901) claims to have found organisms sparingly present in healthy tissues. [24] Backhaus, Milch Zeit., 26: 357, 1897. [25] Freudenreich, Die Bakteriologie, p. 30. [26] Stocking, Bull. 42, Storrs Expt. Stat., June 1906. [27] Harrison, Cent. f. Bakt., II Abt., 5: 183, 1899. [28] Drysdale, Trans. High. and Agr. Soc. Scotland. 5 Series, 10: 166, 1898. [29] Schuppan, (Cent. f. Bakt., 13: 155, 1893) claims to have found a reduction of 48 per cent. in the Copenhagen filters while in the more extended work of Dunbar and Kister (Milch Zeit., pp. 753, 787, 1899) the bacterial content was higher in the filtered milk in 17 cases out of 22. [30] Backhaus and Cronheim, Journ. f. Landw., 45: 222, 1897. [31] Eckles and Barnes, Bull. 159 Iowa Expt. Stat., Aug. 1901. [32] Dunbar and Kister, Milch Zeit., p. 753, 1899. Harrison and Streit, Trans. Can. Inst., 7: 488, 1902-3. [33] Doane, Bull. 88 Md. Expt. Stat., May 1903. [34] Eckles, Hoard's Dairyman, July 8, 1898. [35] Fraser, Bull. 91, Ill. Expt. Stat. [36] Fraser, Bull. 91, Ill. Expt. Stat., Dec. 1903. [37] Stocking, Bull. 42, Storrs Expt. Stat., June, 1906. [38] Backhaus. Ber. Landw. Inst. Univ. Koenigsberg 2: 12, 1897. [39] De Schweinitz, Nat. Med. Rev., April, 1899. [40] Conn, Proc. Soc. Amer. Bacteriologists, 1902. [41] Freudenreich, Ann. de Microg., 2:115, 1890. [42] Conn, Bull. 26, Storrs Expt. Stat. [43] New York City is supplied with milk that is shipped 350 miles. [44] Park, N. Y. Univ. Bull., 1: 85, 1901. [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. CHAPTER IV. FERMENTATIONS IN MILK AND THEIR TREATMENT.