CHANGES OF INSECTS.
Insects are strikingly distinguished from other animals, by a succession of changes in their organization and forms, and by their incapacity of propagating before their last metamorphosis, which, in most of them, takes place shortly before their death. Each of these transformations is designated by so many terms, that it may not be useless to observe to the reader, who has not previously paid attention to the subject, that larva, caterpillar, grub, maggot, or worm, is the first state of the insect on issuing from the egg; that pupa, aurelia, chrysalis, or nympha are the names by which the second metamorphosis is designated, and that the last stage, when the insect assumes the appearance of a butterfly, is called the perfect state.—North American Review.