PREFACE. 



The undersigned has been engaged, scientifically and practically, 

 in the dairy industry in all its branches for a number of years, and 

 thus has had, frequently, occasion to seriously feel the want of a 

 uniform method of analysis for milk and its products, which would 

 not only satisfy practical wants, but would also possess scientific 

 accuracy. 



The author has made it his task to present in this small volume 

 a short and exact method of analysis for the examination of the 

 various milks and infants' milk foods, and hopes to soon complete 

 his undertaking by the issue of a similar volume which shall com- 

 prise the examination of the other milk products and such other 

 substances as are employed in the dairy industry. 



As may be seen by the contents, undersigned has not endeav- 

 ored to criticise the various older methods, as yet generally in use, 

 as this wonld have been beyond the range of his self-imposed task. 



Moreover, there is no want of such books. Undersigned 

 therefore refers to those previously published by Yieth, Eaden- 

 hausen and himself. 



It is a peculiar fact, that even in the latest chemical, medical 

 and pharmaceutical works, old and abandoned methods are con- 

 tinually republished, the authors considering it apparently unnec- 

 essary to test them for their reliability. 



Likewise, in the adducing of average figures regarding the 

 composition of milk, these authors seem to be prepossessed in 

 favor of the oldest and least exact investigations, while they 

 neglect the more exact and, therefore, more valuable examinations 

 of the present period. 



