ACKNOWLEDGMENTS. 



The following figures have been copied by permis- 

 sion from Bessey's " Botany," Henry Holt & Co. : 

 44, 60, 61, and the larger portions of 41 and 42 ; 

 and the following from Wood's "Botanies," A. S. 

 Barnes & Co.: 24, 25, 26, 27, 28, 29, 34, 48, and 58. 



