PREFACE TO THE SECOND 

 EDITION. 



That a new edition of this work is called for o: 

 year after the appearance of the first edition is gratif 

 ing evidence of widespread interest in the subject 

 milk hygiene. 



A few corrections and changes have been made 

 the text and new matter has been added to give in dets 

 what may be regarded as the official method for ti 

 examination of milk for bacteria and cells. 



L.P. 



