VI PREFACE. 



That tliis second edition is indeed an improved and 

 augmented one will be evident from even a very cursory 

 examination of its pages, there being but few lines which do 

 not bear the marks of the revision. The chapter on the 

 analysis of butter-fat is indeed entirely re-written, and brought 

 up to the standing point we have attained through the 

 labours of Mr. BeU, Dr. Dupr6, Dr. Muter, and others. An 

 entirely new chapter on the specific gravity of butter-fat has 

 been added. 



We trust that the book will, in its new form, be as 

 favourably received by both analysts and the trade, as it 

 was in its first issue. "We hope that a real want is satisfied 

 by it, it giving to the analyst accurate methods for detecting 

 adulteration, tested carefully and found sound and correct, 

 and protecting the trade from unjust prosecutions under the^ 

 Sale of Food and Drugs Act, and from the dangers of the old 

 methods of butter analysis. 



London abb Sottthamptoh, 

 April, 1877. 



