"Plants are only reproduced once a year, whereas in insects, especially among the smaller species, one season gives birth to several generations. Among insects there are numbers who live upon other insects; there are some, as the spiders, which devour with indifference their own as well as other species; they serve for food to the birds; and fowls, both wild and tame, are destined for the nourishment of man, or the prey of carnivorous animals. Thus violent deaths seem to be equally as necessary as natural ones; they are both modes of destruction and renovation; the one serves to preserve nature in a perpetual spring, and the other maintains the order of her productions, and limits the number of each species."