VI PREFACE 



Waid of the Michigan Agricultural College, both of 

 whom read the entire manuscript and made many valu- 

 able suggestions and criticisms. Acknowledgment is 

 also due Dr. William Frear of The Pennsylvania State 

 College for assistance in connection with the chapter on 

 Mushrooms, and to Mr. Harold Ware, a practical and 

 scientific grower of mushrooms, who made many timely 

 comments on this subject; to Dr. C. W. Stoddart of The 

 Pennsylvania State College for reading the section on 

 fumigation with hydrocyanic gas; to Prof. J. F. Adams 

 of The Pennsylvania State College, who read the notes on 

 diseases affecting lettuce, tomato and cucumber; to Prof. 

 R. W. DeBaun of Rutgers College and B. C. Haines of 

 Norfolk, Virginia, for data furnished relating to culture 

 of frame crops; and to Miss Julia C. Gray for editorial 

 services. 



Most of the illustrations were made by the author upon 

 visits to commercial establishments, and we gratefully 

 acknowledge the courtesies extended in this connection 

 by a large number of growers, including M. L. Ruetenik, 

 Cleveland, Ohio; Searles Brothers, Toledo, Ohio; 

 Chauncey West, Irondequoit, N. Y. ; Dunbar and Hop- 

 kins, Ashtabula, Ohio; J. H. Rice, Ashtabula, Ohio; R. 

 Hittinger, Belmont, Mass. ; Wyman Brothers, Arlington, 

 Mass. ; F. J. Zuck, Erie, Pa. ; W. H. Weinschenk, New 

 Castle, Pa. ; H. H. Mishler, Johnstown, Pa. ; and others. 



We are indebted to Kroeschell Bros. Co., Chicago, Til., 

 for illustrations Nos. 1, 148 and 149 ; to H. F. Tompson, 

 Arlington, Mass., for illustration No. 2; to "Lord and 

 Burnham Company, New York City, for illustration 

 No. 8; to Hitchings & Company, New York City, for 

 illustration No. 10; to John A. Evans Company, Rich- 

 mond, Ind., for illustration No. 19; to Skinner Irri- 

 gation Co., Troy, Ohio, for illustrations No. 26 and 54 ; to 

 R. W. De Baun of Rutgers College for illustrations Nos. 

 27, 133, 135, 140, 141, 143, 144 and 145 ; to C. O. Jclliff 



