PREFACE 
author therefore believes that this volume will be much more helpful than any previous 
edition, especially as it contains so many new subjects. 
As did A. I. Root in his modest preface of 1877, so the present author feels that he 
is indebted in a very large way to the thousands and thousands, over all this land, who 
have not only shown him their methods and appliances, but have by letter and otherwise 
helped to furnish the material that is given in these pages. 
Feb. 1, 1923. 
ERNEST R. ROOT. 
