PREFACE 



Librarian of Columbia University Library, for 

 the courtesies of the library ; Dr. D. T. MacDou- 

 gal, Director of the Laboratories of the New 

 York Botanical Gardens, Bronx Park, for privi- 

 leges of the museum and conservatories; Sie- 

 brecht & Sons, New York, for valuable sugges- 

 tions on window-gardening; Dr. Sylvester D. 

 Judd, Biological Survey of the United States 

 Department of Agriculture, for permission to 

 quote copiously from his report on Food of Nes- 

 tling Birds; Prof. John G. Jack, of the Ar- 

 nold Arboretum, for valuable suggestions, and 

 characteristics of trees and shrubs; Miss Amy 

 Schiissler, head teacher of Speyer School, New 

 York, for practical suggestions. 



The author desires especially to acknowledge 

 her indebtedness to the following books of refer- 

 ence: Sargent's, The Silva of North America; 

 Bailey's Cyclopedia of American Horticulture; 

 Gray's Manual of Botany; Harriet L. Keeler's 

 Our Native Trees and Our Native Shrubs; the 

 magazine, Garden and Forest; reports of the 

 United States Department of Agriculture; and 

 King's Soil. 



The thanks of the author are extended to the 

 following for use of photographs for purposes 

 of illustration : Board of Education, New York, 

 for A Roof Playground, Public School 153, 

 Bronx, and two views of the Children's School- 



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