PREFACE TO REVISED EDITION 



Two editions of this book have been issued within 

 the first year after its publication. Before printing 

 another edition it seems advisable to make some ad- 

 ditions that have been suggested by friendly criticism. 

 A section on the "Sampling and Testing of Gathered 

 Cream" is added to Chapter V. The author has also 

 rewritten Chapter XIV. Gray's rapid test for water 

 in butter, which was included as an appendix in the 

 second edition, is transferred to the body of the book 

 under Chapter VI. For the marked favor with which 

 this little book has been received, appreciation can not 

 be expressed in any way more substantial than by 

 making an effort to keep the subject matter up to date. 



L. L. VAN SLYKE. 

 Geneva, N. Y., September, 



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