BOOK V.--In the former books animals are for the most part described

with reference to their several parts. In the fifth book they are treated as entire, and especially with regard to their mode of reproduction. First of all, our author treats of spontaneous reproduction, and then of those animals which spring from a union of the sexes; and from this he proceeds to some detail with respect to different groups of animals, testacea, crustacea, insects. The book concludes with a long description of bees and their habits.