ADVERTISEMENT 



TO THE REVISED EDITION, 1863. 



The additions and alterations of the Revised Edition of this work, now 

 issued, are mainly the following. 



1. The addition of an entirely new part, entitled Garden Botany, 

 an Introduction to a Knowledge of the Common Cultivated 

 Plants : see pp. xxix. - lxxxix. By this, the common exotics, no less 

 than the wild plants, are made available for botanical classes, which will 

 be a <jreat convenience in many cases. Most of these cultivated plants 

 are everywhere common, and generally at hand for botanical illustration ; 

 and it is desirable that they should be scientifically known and rightly 

 named. And there is no great difficulty in studying them, if double flow- 

 ers, and those which are otherwise in a monstrous or unnatural condition, 

 be avoided, at least by beginners. It is obviously absurd and highly in- 

 convenient to mix in the cultivated with the wild plants in such a work as 

 this. But a separate account of the common exotics, annexed and sub- 

 sidiary to the Botany of the Northern United States, especially in the School 

 Edition, will doubtless be popular and useful. Directions for the use of 

 the Garden Botany will be found on p. xvii. and p. xxix. 



2. The Analytical Key, p. xvii., upon which the pupil so greatly 

 depends, has been altogether revised, much simplified, adapted to the 

 Garden Botany as well as to the Botany of the Northern States, and printed 

 in a larger type. 



3. Numerous corrections in particulars have been made throughout the 

 body of the work, whenever the required alterations could well be effected 

 upon the stereotype plates. Many others, suggested by acute and obliging 

 correspondents, or by my own observation, are necessarily deferred until 

 the work can be recomposcd. 



4. The plants which have been newly detected within our limits, and 

 one or two which were before accidentally omitted, are enumerated and 

 characterized in the Addenda, p. xc. 



5. Eight plates have been added, crowded with figures, illustrating all 

 the genera (GC, in number) of Grasses. They are wholly original, having 

 been drawn from nature and engraved by Mr. Sprague. They will be of 

 great assistance in the study of this large, difficult, and important family. 



The flattering success which the Manual has met with stimulates the 

 author's endeavors towards its continued improvement; — in regard to 

 which he still solicits aid from his correspondents. 



Harvard University, Cambridge, March 10, 1863. 



