PREFACE. 



A small treatise, the basis of the present work, was 

 originally published in the Transactions of the New York 

 State Agricultural Society for 1850, under the title of 

 "Agricultural Dynamics," or the Science of Farm 

 Forces. A revised and greatly enlarged edition, adapted 

 to general use, was afterwards issued in book form, with 

 the name of " Farm Implements." Since the appearance 

 of the earlier editions, great and rapid improvements have 

 been made in farm machinery of nearly every kind ; and 

 the aim of the work in its present form is to supply, so 

 far as its limits will admit, the information eagerly sought 

 by cultivators in relation to all that has proved of value. 



Another principal object has been to present in a simple 

 and intelligible manner, the leading principles of Mechan- 

 ical Science, applied directly in the farmer's daily routine, 

 that he may know the reasons of success and failure, 

 and not be guided by random guessing. The first portion 

 of the book is chiefly devoted to a practical explanation 

 of these principles. 



Uxiojs- Springs, N. Y 1869. 



