Preface 



This booklet has been written for dairymen and milk- 

 ers who produce milk and cream, destined for delivery to 

 a creamery. 



Its object is to contribute to the incessant efforts for 

 the improvement of milk as a raw material for the manu- 

 facture of dairy-products. 



It is kept free, as far as possible, of learned expres- 

 sions and figures, in order to make it a practical guide for 

 those dairymen and milkers, who have not had the privi- 

 lege of attending instruction-courses in dairying. 



The problems of the eradication of Tuberculosis in 

 milk cows, and other diseases in cattle have not been dealt 

 with in this treatise, as being of a veterinary nature and 

 outside its scope. 



The hope is felt that it may help to impress on a 

 great numbers of dairymen and milkers the urgency of 

 greater efforts for the production of clean milk ; the raw 

 material for a class of food-products, that has such an 

 important part in the feeding of the people. 



Loleta, Calif., 



May, 1920- 



J. POSTMA. 



