PREFACE 



This book is intended as a guide to the analysis 

 of milk and milk products in the routine of the 

 commercial and food-inspection laboratory. 

 Only processes of practical value have been given, 

 and nothing has been said as to the food value 

 of milk and its products, nor concerning the ef- 

 fects of the several adulterants that may be 

 detected. 



A notable portion of the text has been taken 

 from Volume 8 of the Fourth Edition of Allen's 

 Commercial Organic Analysis. I am indebted to 

 the courtesy of Messrs. P. Blakiston's Son & Co. 

 for permission to use this matter. 



An interesting point is to be noted in the com- 

 parison of this edition with the first, issued about 

 a score of years ago in association with Dr, 

 William Beam. In that, a considerable part of 

 the material was derived from the publications 

 of foreign workers; in the present, American in- 

 vestigations form the basis of many of the im- 

 portant processes. 



" Westward the star of empire takes its way." 



H. L. 

 Philadelphia. 



