Alfred Edmund Brehm 
Brehm’s Life of Animals [PDF ebook] 
A Complete Natural History for Popular Home Instruction and for the Use of Schools

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Since Lamarck in 1797 suggested the division of the Animal Kingdom into the two sub – kingdoms of animals with and without backbones, this division has been generally accepted. In the subdivision of the Vertebrates there are usually recognized five classes: the Mammals the Birds (aves); the Reptiles (rt the Amphibious Animals, like the Frog, Newt, etc. And the Fishes (pisces).