Introduction. 5 



other methods were published shortly after it had been 

 given to the public. 



7. Other milk tests. Of these may be mentioned, be- 

 sides the Babcock test already spoken of, the Failyer and 

 Willard method, 1 Parson's method, 2 Cochran's test, 3 the 

 Patrick or Iowa station test, 4 and the Beimling (Leif- 

 mann and Beam) test. 5 Of foreign methods published at 

 about the same time, or previously, the Lactocrite, Lie- 

 bermann's method, 7 the Schmid, 8 Thorner, 9 Nahm, 10 and 

 Kose- Gottlieb 11 methods may be noted. 



8. All these tests were similar in principle, the solids 

 not fat of the milk being in all cases dissolved by the 

 action of one or more chemicals, and the fat either meas- 

 ured as such in a narrow graduated tube, or brought into 

 solution with ether, gasoline, etc., and a portion thereof 

 weighed on evaporation of the solvent. While this prin- 

 ciple is an old one, having been employed in chemical 

 laboratories for many years past, its adaptation to prac- 

 tical conditions, and the details as to apparatus and chem- 

 icals used were of course new and different in each case. 

 The American tests given were adopted to a limited 

 extent within the states in which they were originated 



1 Kansas experiment station report, 1888, p. 149. 



2 N. H. experiment station report, 1888, p. 69. 



3 Journal of Anal. Chem., Ill (1889), p. 381. 



4 la. exp. sta., bull. No. 8, February, 1890; Iowa Homestead, June 14, 1889. 



5 Vermont exp. sta., bull. No. 21, September, 1890. For description of 

 these and other volumetric methods of milk analysis, see Wiley, Agricul- 

 tural Analysis, Vol. Ill, p. 490 et seq; Wing, Milk and its Products, p. 33 

 et seq, and Snyder, Chemistry of Dairying, pp. 112-113. 



6 Analyst, 1887, p. 6. 



7 Fresenius' Zeitschr., 22, 383. 



8 Ibid., 27, 464. 



9 Chem. Centralbl., 1892, 429. 



10 Milchzeitung, 1894, No. 35; 1897, No. 50. 



11 Landw. Vers. Stat., 40, 1. 



