Not until the middle of the nineteenth century did dairying take its place among the important industries of the world and science begin to be applied in its development. Between 1860 and 1870 Thomas R. Segelcke, the “Father of Scientific Dairying” in Denmark, introduced the thermometer in churning instead of the rule of thumb and started the keeping of records in the manufacture of butter. N. J. Fjord started a series of experiments in the creameries, continued through the next decades, and which became models for similar work throughout the world, covering pasteurization, ice houses and cold storage, comparison between various systems for raising the cream, separators, feeding rations, etc., and Denmark developed its agriculture and dairy industry to an enviable position. About the same time Dr. Schatzman applied scientific methods in cheese making in Switzerland and Jesse Williams started the first American cheese factory near Rome, N.Y., while L. B. Arnold, X. A. Willard, Harris Lewis, Harry Burrell and many other progressive dairymen made Herkimer County cheese famous. From New York, dairy farming spread rapidly westward through Ohio to Michigan and Northern Illinois, where butter making was developed around Elgin, and to Wisconsin, where Governor Hoard preached the gospel of progress, Babcock invented and gave to the world the famous test that bears his name and Russell made a specialty of dairy bacteriology. [Illustration: J. H. Monrad, the “Pen and Ink” buttermaker of New York Produce Review ] [Illustration: Governor W. D. Hoard, of Wisconsin, promotor of progressive methods of dairying ] [Illustration: J. A. Ruddick, Dairy Commissioner of Canada ] J. H. Monrad, Assistant Dairy Commissioner of Illinois, student, writer and lecturer on dairy subjects, collected and indexed one of the most complete and valuable libraries of dairy literature found anywhere, which after his death in 1915 was taken over and installed in special rooms by Chr. Hansen’s Laboratorium in Copenhagen, where a librarian is keeping it up to date and it is open to the public. In Canada, Dairy Commissioners Jas. W. Robertson and J. A. Ruddick, D. M. McPherson, the “Cheese King,” and others contributed to an enormous development of the manufacture of high-class cheese, and in New Zealand and Australia similar progress was made. Business and science have vied with each other in increasing the output of dairy products and improving their quality. In the table below, showing estimates for 1917, some interesting figures are given of the amount of milk produced in the United States and the uses to which it is applied.[1] _Uses to which milk is put (calculations based on estimates)_