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. 
