x PREFACE 



Murrill, First Assistant of the New York Botanical Garden, 

 for suggestions as to the method of treatment of the part of 

 the book on fungous diseases and for naming some species 

 of fungi ; and to Mr. Irving T. Guild, Secretary of the Mas 

 sachusetts Forestry Association for furnishing information 

 regarding the shade-tree laws of Massachusetts. The author 

 also wishes to remember the many kindnesses of Dr. James 

 P. Haney, of the New York City Department of Education, 

 who first suggested to him the idea of writing the book. 



All the photographs and sketches for the illustrations are 

 by the author, with the exception, of Plate 24, Fig. 4; Plate 

 41, Fig. 4; and Plate 42, Fig. 5. The making of the photo 

 graphs extended over a period of more than five years. 

 Those elucidating methods of work were taken during oper 

 ations in East Orange. 



WILLIAM SOLOTAROFF. 



EAST ORANGE, N. J., January, 1911. 



