We now come to the Arctic illustrations, commencing with a case of Birds, many of which were collected by Captain Inglefield during one of the recent Arctic expeditions, and presented by him to the Crystal Palace. The specimens are arranged to represent some of the changes of plumage which, at various seasons of the year, are incident to the birds in these remote and extreme climates. The Snowy Owls, the Eider Duck, the Gannet, and various birds frequenting the sea-coast, are beautiful and prominent specimens in the collection. It has been attempted in this illustration to present the visitor with some idea of the peculiar features of this region. It was necessary here, in the absence of all botanical specimens so attractive in the other departments, to attempt the representation of icebergs, and the snowy aspect of the country. The Ethnological group in the further recess is formed of two Samoiedes, or natives of Arctic Russia in their winter dresses of fur. The male native holds in his hand a pair of the very peculiar snow-shoes which are used by these people. The group nearest to the spectator consists of two males, a female, and child of the Lapland race, in their curious national dress. The scarlet costume of one of the male figures is, however, the summer dress, but is placed here for contrast with the other example, which is the kind of clothing adopted in the rigorous winter. On the right appears a Greenlander in his skin canoe, and armed with the implements of chase, by which he captures Whales, Seals, Birds, and other animals. The largest Polar or White Bear was killed by Captain Inglefield with a single pistol shot, when he was closely and dangerously attacked by the monster. The other animals consist chiefly of the Reindeer, Arctic Foxes, Esquimaux Dogs, Seals, &c. This illustration has been arranged and designed by Mr. A. D. Bartlett, under whose superintendence the Natural History Department is now placed. Before leaving this side of the Palace to proceed in the examination of the Natural History Department on the other side of the Nave, we must not omit to particularly notice the interesting illustrations of aquatic natural history, which will be found in the various positions which are indicated. Most of these differ from the other objects in the department, inasmuch as they are living specimens; but they will all tend to give us some idea of how vast and how wonderful are the works of Nature, how various and how marvellously fitted each to its own function in the great universe. On the right-hand side of the path by which we entered the department from the Transept, is a case filled with West Indian sponges, arranged to represent, as far as may be, the aspect of the bottom of the sea in that region, and the form of growth of these curious marine productions. This rare collection of sponges is the property of J. S. Bowerbank, Esq., who has kindly lent them to the Crystal Palace Company, and arranged them himself.