industries since their beginning, curtailing their development and 

 depriving them of much of the light of advanced science to which 

 they are justly entitled and which they need for their greatest devel- 

 opment for the lasting benefit of the producer, manufacturer and 

 consumer alike. 



O. F. HUNZIKER. 

 Purdue University, March, 1914. 



PREFACE FOR THIRD EDITION 



Since the issuance of the First and Second Editions of this 

 treatise many changes have taken place in the various phases of the 

 Condensed Milk Industry. Old processes have been modified and 

 improved, new processes have been invented, the equipment used 

 for manufacture has undergone changes, new tests have been de- 

 vised for the determination of the composition of the finished prod- 

 ucts and the entire status of the industry has yielded to an unex- 

 pected, unforeseen and important evolution. 



Of the most outstanding new features in this edition may 

 be mentioned the chapters on Directions for the Standardization of 

 the Sterilizing Process, Evaporated Milk Control, Use of the Mojon- 

 nier Viscosimeter, Manufacture of Condensed Buttermilk and But- 

 termilk Powder, New Patents and Processes for the Manufacture of 

 Milk Powders. Important additions have also been made to the 

 chapters on History of the Industry, Volume of Output, Markets, 

 Exports, Imports, Cost of Manufacture, Standardization of Con- 

 densed Milk, and Prevention of Condensed Milk and Milk Powder 

 Defects. 



In preparing this Edition, the author has endeavored to com- 

 pletely revise the old edition, incorpoarting in the revised edition the 

 many changes which the tooth of time has wrought and to bring this 

 treatise in all its important phases up-to-date. 



O. F. HUNZIKKR. 

 Chicago, 111., September, 1920. 



