PREFACE ~ 
purely horticultural brary. For this reason many books relating to forestry, especially those 
descriptive of the early efforts at forest management in this country and Europe, will be found in 
the Library, although the Arboretum is a museum for the study and display of trees and shrubs and 
not a school of forestry. 
Only a few books on tany, vegetable pathology, physiology, entomology, and land- 
sespe-gardening are found in this Library. These are subjects which should be more fully repre- 
sented in s brary intended to furnish the best possible opportunity for the study of trees, but the 
Arboretum Library has grown so rapidly in other directions that it has not been practicable to pay 
to these subjects the attention their importance demands. 
To the preparation of this catalogue Miss Tucker has devoted ten years, during which the 
Library has grown from ten thousand to thirty thousand bound volumes. A second volume of the 
catalogue is in preparation, in which, to facilitate the use of the Library, the books will be arranged 
according to the subjects of which they treat. 
C. S. Sarcenr. 
Sertexece, 1914. 
