PREFACE 



THE English translation of Dr. Barthel's well-known book is 

 practically a new edition, for the subject matter has been 

 completely revised and considerable additions have been made 

 to it. Those engaged in the examination of milk or dairy 

 products will find in this volume a detailed description of the 

 most reliable methods used in this important branch of 

 analytical work. As many of the methods have been carefully 

 tested by the author himself they are to be regarded as the 

 most satisfactory ones to be followed. The proofs of this 

 edition have been seen and approved by Dr. Barthel. 



W. GOODWIN. 



WVE, March, 1910. 



