PKEFACE. 



' SYLVAN I A. 



assistance of the most experienced experts. "Without 

 the generous aid of these gentlemen, a work of this 

 character could not have 

 ^Q |^^ been published. Their sen-- 



ices are entitled to the full- 

 est recognition, which is 

 most gladly accorded. 



Among the scientists 

 who have aided in the prep- 

 aration of this book, special 

 credit is due Prof. "William 

 Frear, in charge of tobacco 

 work at the Pennsylvania 

 experiment station, who is 

 the author of the admirable 

 treatise on the bacteriology 

 of tobacco; Dr. E. H. Jen- 

 kins, vice director of the 

 Connecticut experiment station, under whose manage- 

 ment the famous Poquonock experiments have been 

 conducted; Prof. H. Garman, 

 entomologist to the Kentucky 

 experiment station, whose assist- 

 ance has been invaluable in the 

 preparation of the chapter on in- 

 sect pests ; Prof. M. A. Scovell, 

 director of the Kentucky experi- 

 ment station ; Prof. "W. C. Stubbs 

 and J. G. Lee, director and vice 

 director of the North Louisiana 

 experiment station ; President 

 Le Roy Broun of the Alabama 

 agricultural college ; Dr. C. A. 

 Goessman of the Massachusetts 

 experiment station and Prof. R. J. Davidson, chemist 

 to the Virginia experiment station. Full use has also 



PROF. H. GARMAN, KENTUCKY. 



