vi INTRODUCTION. 



by carefully selected planks, or burls, which often show better than 

 logs the true industrial value of the wood. 



Specimens of a few of the arborescent species of the United States 

 have not yet been secured, and others are still in preparation. 

 These will be added to the collection as rapidly as possible. 



A series of life-size water-colors of the foliage, flowers, and fruit 



of each tree represented in the collection by a wood specimen is in 



course of preparation. They will be displayed with the collection 



as fast as completed. An herbarium of the trees of the United 



States, arranged by Mr. C. E. Faxon of the Arnold Arboretum, will 



afford special students of dendrology an opportunity of critically 



■•tudying the collection. 



The following catalogue of the trees of this country will serve 



a guide to the collection ; it is condensed from Vol. IX. of the 



">rts of the Tenth Census, from which are derived the tables 



g to the physical properties of the woods of the United 



These tables have been prepared for this publication by 



5. P. Sharples, of Cambridge. 



C. S. SARGENT. 



-nold Arboretum, Bkookline, Mass., 

 May, 1885. 



