The particulars in which, the serpent differs from the lizard are, that the former have no feet, cast their bright coats annually (like our metropolitan postmen), and swallow their food without masticating it. They occupy seven cases. The upper part of the first case contains many of the most poisonous serpents. Among these are the well-known and formidable Rattlesnakes of America, with specimens of their rattles lying near them, which, as the visitor-will see, are a succession of osseous joints. Here too are the terrible cobra di capello, and other poisonous serpents of India; the South American fer de lance; the vipers of Europe; the North African crested viper; and the Cape of Good Hope and Western African puff adder; the Guinea nosehorn viper, and the common viper found in England--our only dangerous serpent. These serpents all inflict their poisonous wounds by means of two fangs, which they protrude from the mouth, and from the points of which they inject the poisonous matter into the wounds they inflict. On the lower shelves of this case the visitor will find some specimens of the Sea-Serpents, which frequent the East Indian seas, and the coast of New Holland. They are dangerous reptiles, having small fangs amid their teeth, with which they attack bathing animals or men. Some of them have been found sleeping on the warm bosom of a tropical ocean; and upon the warm sands of the shore they are often found, coiled up in a torpid state. They vary greatly in size: but the visitor will perceive none approaching in length to that remarkable reptile which artists, despairing in their attempts to give it the proper dimensions, lately coiled about the wide pages of pictorial papers.