loo Wood's Class Book of Botany. [August, 



head of Linnaeus for his developments in botanical knowledge. 

 It is not easy to see what improvement can supersede the use of 

 the analysis given by Mr. Wood in this Class Book, as it is 

 modestly named by the author — a Class Book, so rich in this 

 science. 



This edition is enriched by some new genera and species. 

 A tour of the author the last year through a considerable portion 

 of the western states afforded him many treasures which the work 

 contains. 



The work is made far more valuable, too, by the introduction 

 of many foreign species which are now of common occurrence in 

 shrubberies, or in the richer gardens and green-houses. The stu- 

 dent will be glad to find the additional species of the Buck Eye 

 and Horse Chesnut family; of the Elaeagnaceae, as the beautiful 

 Shepherdia argentea, so easily cultivated; the species of Daphne, 

 Clarkia, Fuchsia, Lonicera Tartarica, Viscum, Platea and Ailan- 

 thus; or, as Loudon gives the last, Ailantus, from Ailanto, the 

 name of an eastern species. 



Many, who will use this class book, will not be disappointed in 

 finding several species of Pseonia; many of the Rosa, the new 

 Sidlivantia, the Itea, the beautiful and odoriferous Calycanthus, 

 and many others. A few more introduced plants may find a 

 place in subsequent editions. 



The edition is the more valuable from the authority of the 

 w^orks whose nomenclature and names are generally adopted; as 

 of Drs. Torrey and Gray, our distinguished botanists and standard 

 writers on our botany. 



The great divisions of the vegetable world are fully and clearly 

 expounded. 



1. The Phrenogamia, or Flowering Plants. 



2. The Cryptogamia, or Flowerless Plants. 



The Phaenogamia, from their manner of growth, are distin- 

 guished into — first, Exogens; and second, Endogens. 



The Exogens form two classes, as they have covered or naked 

 seeds, called 

 L Angiosperms; and 

 IL Gymnos})erms. 



The Endogens form two classes, as they have glumes or not, 

 called 

 in. Aglumaceous; and 

 IV. Glumaceous. 



The Cryptogamia also form two classes. "The mutual rela- 

 tions of the six classes with the higher divisions" are shown in 

 the Class Book in the following manner: 



