Brehm's Life of Animals - A Complete Natural History for Popular Home Instruction and for the Use of Schools #233452

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).