iv Testing Milk and Its Products. 



Acknowledgment is due to the following parties for the use 

 of electrotypes, viz : Creamery Pkg. Mfg. Co., Chicago, 111.; 

 Vermont Farm Machine Co., Bellows Falls, Vt; Elgin Mfg. 

 Co., Elgin, 111.; D. H. Burrell & Co., Little Falls, N. Y.; De 

 Laval Separator Co., New York City; Henry Tromner, Phila- 

 delphia, Pa.; Springer Torsion Balance Co., New York City; 

 J. H. Monrad, Winnetka, 111.; Borden & Selleck Co., Chicago, 

 111.; Dairymen's Supply Co., Philadelphia, Pa.; Bausch & 

 Lomb Opt. Co., Rochester, N. Y.; John W. Decker, Columbus, 

 Ohio, C. L. Fitch, Fort Atkinson, Wis., and the agricultural 

 experiment stations at New Haven, Conn., and Madison, Wis. 



Madison, Wis., October 1, 1897. 



PREFACE TO EIGHTH EDITION. 



The first three editions of this book were disposed of in about 

 a year and the seventh edition was exhausted three years later. 

 Every year that passes brings some valuable contributions to 

 our knowledge of the subjects treated in the book and a fre- 

 quent revision of it is therefore desirable. 



The present edition contains all the methods and descrip- 

 tions that have stood the test of actual use during the past few 

 years and the new information which has appeared since the 

 last revision of the book, has been carefully sifted and what 

 was deemed of sufficient importance has been incorporated in 

 such detail as the scope of the book permitted; many changes 

 and additions suggested by the experience of the authors have 

 also been introduced. In brief the book has been subjected to 

 a renewed, critical examination and revision. The general 

 adoption of it as a text book in American Dairy Schools, as well 

 as the favorable reception which it has been accorded by users 

 of Babcock testers and the dairy public in general is naturally 

 a source of gratification to the authors. 



Madison, Wis., July 1, 1901. 



