6 PREFACE TO SECOND EDITION. 
loaned by Professor John Gifford, Figure 9 is from H. B. Ayres, 
Figure 32 from W. H. Rau. By permission of Houghton, Mif- 
flin & Co. the typical botanical figures of plates 14, 15, 21, 22, 
23, 24, 26, 31, 35, 43, 45, 49, 55 and 63 have been redrawn from 
the “Silva of North America.” The typical botanical figures of 
plates 1, 6, 7, 10, 20 and 25 are redrawn from “Baume und 
Straucher des Waldes.’’ Plate 52 is redrawn from Flora von 
Deutschland, Oesterreich u. d. Schweiz. 
SAMUEL B. GREEN. 
January 30, 1902. 
