APPENDIX 



Note I. 



Among those persons into whose hands these volumes 

 may fall, there will probably be some who are not well 

 acquainted with the different branches of natural history, 

 and who are most especially deficient in the knowledge 

 of the names and distribution of zoological groups. I 

 have, therefore, considered that it would be desirable to 

 furnish my readers with a brief synopsis of classification, 

 which might at the same time serve as a kind of 

 vocabulary. In order to avoid entering too much into 

 detail, I have limited myself to the enumeration of 

 classes (passing over the subordinate groups), orders, 

 families, and genera. Those readers who may desire to 

 advance further into this department of natural history, 

 and who may be anxious to examine plates of the animals 

 they are studying, will do well to consult, as works of 

 general reference, the elementary treatises of M. Milne 

 Edwards, more particularly his Elements de Zoolnaip^ in 

 2 vols., and the illustrated edition of Cuvier's Regne 

 Animal, published under the direction of his most distin- 

 guished pupils. 



Adopting in this respect the ideas first enounced by 

 several German authors, we will admit the existence of 

 four kingdoms of nature — viz. the mineral, vegetable, 

 animal and hominal kingdoms. Man is the exclusive re- 

 presentative of the last of these kingdoms, which, there- 



T 4 



