parenthesis. In the case of exotics which are not included in the 

 Manual, other authorities have been followed. Sudworth's 

 "Check List of the Forest Trees of the United States" (U. S. 

 Dept. Agr., Div. Forestry, Bui. 17) is in most cases authority 

 for the common names. They are names appearing in common 

 use today in some part of the state. The first name given is that 

 recommended by Sudworth for general use. 



The drawings have been made from living or herbarium 

 material and are original. They are accurately drawn to a 

 scale, which is given in each case. In their preparation the 

 author has endeavored to call attention to the salient characters. 

 In the drawings of buds and twigs certain points, bundle-scars, 

 etc., have been emphasized more than is natural. In the descrip- 

 tions the attempt has been made to bring out those points of 

 similarity and contrast which are most useful for identification. 



As the bulletin is not written especially for technical students 

 of botany, the author thought best to use as few technical terms 

 as possible in the descriptions. In some cases it was impossible 

 to avoid such terms, but with the help of the glossary the mean- 

 ing can be easily understood. Any person desiring to get a 

 more complete knowledge of trees should consult one of the larger 

 manuals. The arrangement used for the illustration and dis- 

 cussion of each single tree makes it possible for the student to 

 compare the drawings with the description without turning a 

 page. 



It is believed that with the aid of the drawings and descrip- 

 tions given in this bulletin any person will be able to name the 

 trees which grow in his yardi park, or woodlot. If, however, 

 any difficulty is found in naming the trees, the Curator will be 

 glad to name any specimens which may be mailed to him. He 

 would be glad to get in touch with persons interested in Mich- 

 igan trees and to receive any additional information relating to 

 the subject. Data concerning the distribution of the trees in the 

 state, and the addition of other Michigan trees to the present list 

 would be of especial value. 



GEORGE PLUMER BURNS. 



