PREFACE 



This laboratory guide is designed to give the beginning 

 dairy student a few suggestions in the study of the produc- 

 tion and care of milk, and the testing, manufacturing, and 

 marketing of dairy products. It is the outgrowth of a 

 demand from dairymen, creamerymen, and high school, 

 short course, and college students for a guide in the practical 

 application of modern dairy science. 



It will be quite necessary to supplement these exercises 

 with text-book references in order that the student may gain 

 a thorough knowledge of the underlying principles of dairy- 

 ing. A grasp of the fundamental principles in each exercise 

 herein followed out systematically and applied in practice is 

 bound to bring results. 



The writer is indebted to the Creamery Package Manu- 

 facturing Company and the J. G. Cherry Company for a 

 number of the cuts used in this book. 



G. L. MARTIN. 



North Dakota Agricultural College, 

 January 1 ; 1913, 



