illi 



PREFACE. ix 



has "worked assiduously during the last eight years, and to the skill of the admirable 



French cngrayers, Avho have reproduced them under the general dii'cction of Monsieur 



A. Riocreux, the most distinguished European botanical artist. I take this oppor- 



tunity to express to them all the sense of my personal obligation for their zeal and 



dcTotion. 



The entomological notes have been supplied by Mr. J. G. Jack of the Arnold Arbo- 



return. Mr. William D. Ely, of Providence, Uhodc Island, and Mr. Erancis Skinner, of 



Boston, have aided me greatly in collecting information relating to the early literature 



of many of the trees described ; and Mr. Faxon's careful scrutiny of the proof-sheets 



has freed them from many errors. A list of the other friends and correspondents -who 



hayc aided me in the preparation of this A^'ork Avould include the names of the chief 



botanists and of the most intelligent lovers and zealous cultivators of trees in America 



and Europe. My sense of obligation and of gratitude to them all is deep and sincere, 



but their number is so great that I must content myself Avitli this general acknoAvledg- 



ment of their kindness and assistance. 



C. S. Sarge^^t. 



Brookli:™, Mass., September, 1890. 



