IV PREFACE 



Much of the subject matter has been derived from our own 

 observation and experience, but we have made use of material 

 from all available sources and we have tried to give credit by 

 continual reference to the authorities used. That a book of 

 this character can never be original, everyone knows. The 

 scojje is too great for the observations of one lifetime. 



We are aware that we have fallen far short of our ideal. 

 But we believe the book will be of much service if followed as 

 suggested and used in connection with Part I. "If a better 

 system is thine, impart it frankly. If not, make use of mine." 



THE AUTHORS. 

 KIRKSVILLE, Mo., 



August, 1912. 



