PREFACE 



Grateful acknowledgement is due the teachers 

 and principals in the schools of Pennsylvania giving 

 work in vocational agriculture, for their cooperation 

 and assistance in making this study possible. Thanks 

 are due my associates at The Pennsylvania State Col- 

 lege, and to Mr. L. H. Dennis, with w r hom many points 

 were discussed. Deepest appreciation is felt for the 

 encouragement and helpful criticism received from 

 Professor Bonser, Professor Dean, and Professor Sned- 

 den, of Teachers College, Columbia University, and 

 from Professor \Y. S. Taylor, of The Pennsylvania 

 State College. 



