You must be acquainted with the origin of our common house flies? PHYS.—We know, that they spring from maggots, and that both the common and blue bottle fly deposit their ova in putrid animal matter, were the eggs are hatched and produce maggots, that, after feeding upon the decomposing animal material, gradually change, gain a hard or horny coat, seem as if entombed, and wait in a kind of apparent death or slumber, till they are mature for a new birth, when they burst their coatings and appear in the character of novel beings—fitted to inhabit another element. HAL.—The history of the birth and metamorphosis of all other winged insects is very similar, but with peculiarities dependent upon their organs, wants, and habits. You know the curious details with which we have been furnished by natural historians of bees and ants, which live in a kind of society. The ant flies, of which, as I mentioned to you, imitations are sometimes used by fishermen, were originally maggots, and became furnished with wings—not, however, passing through the aurelia state for this last transformation. POIET.—I beg your pardon, but, having lately read an account of these animals in the very interesting book, called “An Introduction to Entomology,” I think I can correct you in one particular; which is, that the maggot of the ant _does_ assume the form of a chrysalis or pupa, before it becomes a winged animal. HAL.—It is true, that the _immediate_ transition of the maggot is into a pupa, _then_ into an ant, which is furnished with a kind of case, from which the wings emerge for their perfect transformation into the fly or imago state. The males die soon after the sexual intercourse; the females, when impregnated, lose their wings, and either voluntarily or by force enter into society with neuter or working ants, for the purpose of raising a new generation. POIET.—You are perfectly right; and though it would be irrelevant to our present object, I could almost wish, for the sake of amusing our friends, that you would detail to us some other parts of the marvellous history of these wonderful animals, which, if not so well authenticated, might be supposed a philosophical romance. Such as the neuter or working ants feeding each other and the offspring; the manner in which they make, defend, and repair their dwellings, provide their food, watch and attend to the female, and take care of her eggs; their extraordinary mode of acquiring and defending the aphides and cocci, which bear to them the same relation that cattle do to man, which are fed by them with so much care, and the milk of which forms so important a part of their food; the predatory excursions of a particular species to carry off pupa, which they bring up as slaves.