The author acknowledges with gratitude the wise counsel of Professor Benjamin B. Stout of the Department of Forestry, Rutgers University, and his colleague, Professor Ernest G. Christ, chief Rutgers pomologist. Also helpful were Howard Nielson, C.T.E., of Bernardsville, N.J.; John Savary, tree surgeon, of Phillipsburg, N.J.; and William Flemer HI and George S. Harris of Princeton Nurseries.

Warm thanks for many courtesies and much patience are tendered to Dr. Luther Arrington and his staff in the Rutgers agriculture library. Among the many books used for reference, these should be mentioned:

Tree Care, John M. Haller (The Macmillan Co.); Tree Maintenance, P. P. Pirone (Oxford University Press); The Wise Garden Encyclopedia, E. L. D. Seymour, ed. (William H. Wise & Co.); Textbook of Dendrology, W. M. Harlow and E. S. Harrar (McGraw-Hill Book Co.); Insects and Diseases of Ornamental Trees and Shrubs, Ephraim Porter Felt and W. Howard Rankin (The Macmillan Co.).

Except as otherwise credited, all photographs are by JERRY FOCHT of Belvidere, N.J.

The line drawings are by WASHINGTON IRVING VAN DER POEL of New York City, Art Editor of the New York State Conversationist.

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