ACKNOWLEDGEMENTS 



In the preparation of this booklet the following 

 authorities have been consulted : Gray's Manual of ^^ 

 Botany, 7th Edition, which has been the guide for the^P 

 scientific names; Britton and Brown's Illustrated Flora 

 of the United States and Canada; Schaffner's Catalog 

 of Ohio Vascular Plants, Ohio Biological Survey, Vol. 

 1, Bulletin 2; Keeler's Our Native Trees; Collins' and 

 Preston's Key to Trees ; Otis' Michigan Trees ; Burns|P> 

 and Otis' Trees of Vermont; Bailey's Encyclopedia of 

 Horticulture. 



Most of the drawings are from original specimens, 

 and all of them are done by Miss Mildred C. Green. 



Thanks are due Dr. Charles H. Otis, Professor of 

 Botany, Western Reserve University, for his very 

 generous nnd painstaking criticism of the text and draw- 

 ings; to Director Paul M. Rea of the Cleveland Muse- 

 um of Natural History, for inspiration and sympathetic 

 help during the preparation of the manuscript; to Dean 

 Henry Turner Bailey, of The Cleveland School of Art, 

 under whose direction the cover was designed by stu 

 dents of the School, and to Mr. I. T. Frary, of Th 

 Cleveland Museum of Art, for helpful cricicism of the 

 drawings. 



H. L. M. 



Cleveland, Ohio. 

 December, 1921. 



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