9. The animal fossils are but little comprehended. One finds sometimes the solid and resisting parts, such as bones, scales, and horns. Sometimes these are complete skeleton, but more frequently only detached portions of which it is easy to recognize the production. By the inspection of a jaw or a tooth, one sees immediately whether it belongs to a herbivorous or carnivorous animal. As all the parts of an animal have a necessary correlation, the form of the head, of a shoulder-blade, of a bone of the leg, or a foot, suffices to determine the size, the general form, and the mode of life of the animal. * The terrestrial animals have an organism clearly separating them from aquatic animals. Fish and shell-fish fossils are excessively numerous; shell-fish alone sometimes forming entire beds of great thickness. By their nature, one quickly determines whether they are marine or fresh-water animals.
* At the point to which George Cuvier has carried the science of paleontology, one bone alone suffices often to determine the race, species, and form of an animal, also its habits, by which it can be entirely reconstructed.