Vi PREFACE 



the high schools. I have examined carefully every lesson 

 in the manual and have seen many of them worked out in 

 the laboratory and field, and I am firmly convinced that it 

 meets an urgent need in the high schools to-day. It is 

 scientific, systematic, and, above everything else, it is a 

 workable manual. It can be adapted to the needs of the 

 small and the large high schools. 



In writing this valuable manual the authors have done 

 credit to themselves and have rendered a great service to the 

 high schools. 



EDWIN L. HOLTON. 



DEPARTMENT OF RURAL EDUCATION, 

 KANSAS STATE AGRICULTURAL COLLEGE. 



