[54] H. L. Russell, _Dairy Bacteriology_, p. 46. [55] _Bureau of Animal Industry Reports_, 1895-1896. [56] _British Medical Journal_, 1895, vol. ii., p. 322. [57] _British Medical Journal_, 1895, vol. ii., p. 322. [58] _Journal of Comparative Pathology_, vol. x. (1897), pp. 150-189. [59] E. W. Hope, M.D., D.Sc., _Report of the Health of Liverpool during 1897_, p. 40. [60] S. Rideal and A. G. R. Foulerton conclude, from a series of experiments, that boric acid (1-2,000) and formaldehyde (1-50,000) are effective preservatives for milk for a period of twenty-four hours, and that these quantities have no appreciable effect upon digestion or the digestibility of foods preserved by them (_Public Health_, May, 1899, pp. 554-568). [61] _Report from Wisconsin Agricultural Experiment Station_, 1896. [62] Jenner Institute of Preventive Medicine (First Series _Transactions_). [63] _Centralblatt für Bakteriologie_, etc., II. Abteilung. [64] _A Manual of Bacteriology, Clinical and Applied_, p. 397. [65] Hewlett asserts that butter may contain from two to forty-seven millions of bacteria per gram. [66] Such pure cultures for such purposes are in the United States termed "starters," because they start the process of special ripening. For the sake of convenience the term will be used here. [67] The Essex County Council is one of the few public bodies in England which have undertaken pioneer work in this department of industry. Under the leadership of Mr. David Houston, a course of elementary instruction in dairy bacteriology as applied to modern dairy practice is given in the County Biological Laboratory at Chelmsford. [68] _Report of Storr's Agricultural Experiments Station, State of Connecticut_, 1895. [69] "Observations on Cheddar Cheese Making," _Reports of Bath and West and Southern Counties Society_, 1898, pp. 163-171. Mr. Lloyd's Reports to the West of England Society since 1892 contain various points respecting the application of bacteriology to cheese-making. [70] _Journal of Bath and West of England Society_, 1893, 1895, and 1897. [71] _New York Medical Record_, 1894. [72] _British Medical Journal_, 1896, ii., p. 760 _et seq._ [73] _Special Report of the Medical Officer to the Local Government Board on Oyster Culture, etc._, 1896. [74] Royal Commission on Tuberculosis, _Report_, 1895, pt. i., p. 13. [75] _Ibid._, p. 18. [76] _British Medical Journal_, 1895, vol. ii., p. 513. [77] It should be distinctly understood that this table is merely schematic and provisional. The details of toxin production and its effect are still open to revision and amendment. [78] Sidney Martin, M.D., F.R.S., F.R.C.P., _Croonian Lectures delivered before the Royal College of Physicians_, June, 1898.