ACKNOWLEDGMENT 



The following- individuals, institutions and business 

 houses have supplied the illustrations referred to by 

 figures opposite their names. 



J. R. Bechtel, State College, Pa., photos taken in greenhouses of 

 Henry A. Dreer at Riverton, N. J. 



1, 3, 10, 15, 18, 27, 44, 76, 88, 89, 126, 199. 

 Minnesota Experiment Station, St. Anthony Park, Minn. 



8, 41, 84, 93, 198 



The Ball Manufacturing Co., Glenside, Pa. 12, 30, 86 



The Cloche Company, New York 17 



Royal Palm Nurseries, Oneco, Fla Frontispiece, 25, 85 



Michigan Agricultural College, East Lansing, Mich. 



28, 141 (center picture) 



W. N. Scarff, New Carlisle, O. 29, 100 



H. F. Michell, Philadelphia, Pa 51, 94 



U. S. Department of Agriculture, Washington, D. C. 62, 64, 65, 70 



A. T. de la Mare Co., New York 66, 67, 68, 69 



Lord and Burnham Co., New York 78, 79, 80 



Storrs and Harrison Co., Painesville O. 83, 110, 120 



California Experiment Station, Berkeley, Cal. 



91, 105, 106, 107, 151, 155, 178, 181, 189, 191, 201 

 Ohio State University Extension Dept., Columbus, O. 



103, 117, 170 



Harrison's Nurseries, Berlin, Md. 112, 145, 203, 206, 213 



Massachusetts Agricultural College, Horticultural Dept., Am- 



herst, Mass. 116, 121, 122, 123, 124, 125, 132 



Kelly Brothers, Dansville, N. Y. 128, 211, 212 



New York State Experiment Station, Geneva, N. Y. 



129, 157, 176, 187, 194 

 Isaac Hicks and Son, Westbury, N. Y. 



131, 139, 144, 148, 154, 160, 164, 183 



Maloney Brothers and Wells Company, Dansville, N. Y. 133, 173, 208 

 ix 



