342. It now becomes a matter of inquiry whether such things spring from eggs conveyed to the spot by means of air, or rain, or water oozing through the soil, or whether they spring from the damp and stenches themselves. That these noxious animalcules and insects mentioned above are hatched from eggs which have been carried to the spot, or which have lain hidden everywhere in the ground since creation, is opposed to all observation. For worms spring forth in minute seeds, in the kernels of nuts, in wood, in stones, and even from leaves, and upon plants and in plants there are lice and grubs which are accordant with them. Of flying insects, too, there are such as appear in houses, fields, and woods, which arise in like manner in summer, with no oviform matters sufficient to account for them; also such as devour meadows and lawns, and in some hot localities fill and infest the air; besides those that swim and fly unseen in filthy waters, wines becoming sour, and pestilential air. These facts of observation support those who say that the odors, effluvia, and exhalations emitted from plants, earths, and ponds, are what give the initiative to such things. That when they have come forth, they are afterwards propagated either by eggs or offshoots, does not disprove their immediate generation; since every living creature, along with its minute viscera, receives organs of generation and means of propagation (see below, n. 347). In agreement with these phenomena is the fact heretofore unknown that there are like things also in the hells.