Vlll A CKNO WL ED GMEN T 



Perley Spaulding; C. 0. Townsend ; M. B. Waite; A. F. 

 Woods; B. T. Galloway; C. L. Shear; Hermann von 

 Schrenk; George M. Keed; L. H. Paramell; Wendell Pad- 

 dock ; P. H. Eolfs ; T. J. Burrill ; Geo. E. Stone ; Geo. P. 

 Atkinson; A. B. Cordley; S. M. Tracy; E. J. Durand; 



F. D. Heald ; Nellie A. Brown. 



The authors are also deeply indebted for valuable sug- 

 gestions and for helpful criticism of the manuscript to 



G. P. Clinton who read the portion pertaining to smuts, 

 L. R. Jones potato diseases, J. C. Arthur and F. D. Kern 

 the rusts, Erwin F. Smith the bacterial diseases, Hermann 

 von Schrenk the timber diseases, W. A. Orton and W. W. 

 Gilbert the other portions of the book ; though all respon- 

 sibility for any errors that may occur rests entirely with 

 the authors. Acknowledgment is due to Mrs. F. L. Ste- 

 vens and Mrs. J. G. Hall for aid in preparation of the manu- 

 script and proof. 



