PREFACE 



THE larger portion of the material presented in this book has 

 been collected by the author during the fourteen years while 

 he was engaged in commercial dairy work. Much has also been 

 obtained from the experience of others. The author has during 

 the past ten years taught the subject of creamery management 

 to students, and the material presented in this book has been 

 given to the students in the form of lectures. 



Acknowledgment is due to Professor F. W. Beckman of the 

 Department of Agricultural Journalism of Iowa State College 

 for his valuable assistance, particularly with the chapter on 

 Advertising, which was largely written by him, also to Pro- 

 fessors B. W. Hammer, A. W. Rudnick, and M. R. Tolstrup, 

 who have all assisted in this work. 



The author is indebted to the following parties for the use of 

 electrotypes and illustrations: Creamery Package Manufac- 

 turing Company, Chicago, Illinois; J. G. Cherry Company, 

 Cedar Rapids, Iowa; York Manufacturing Company, York, Pa.; 

 Vilter Manufacturing Company, Milwaukee, Wisconsin; Madi- 

 son Cooper Company, Calcium, N. Y.; National Dairy Council, 

 Chicago, Illinois; The Wisconsin Experiment Station, Madison, 

 Wisconsin; Kansas Experiment Station, Manhattan, Kansas; 

 and the Dairy Division, Department of Agriculture, Washing- 

 ton, D. C. 



M. MORTENSEN. 

 Iowa State College, 



December, 1920. 



