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Preface.
ix
to each other, and especially the friendship and hostility of different species; and these are for the most part referred to the nature of their food, and their mode of procuring it. The notices of fish are not so numerous as those of other groups: this would necessarily arise from the difficulty of observation. At the conclusion of the book, an essay on bees and their congeners is given at considerable length.
Book X.—This book, in all probability erroneously ascribed to Aristotle, is occupied with a treatise on the causes of barrenness in the human species. It appears to be rather a continuation of the seventh book, which ends abruptly; but it is well placed at the end, as no genuine work of our author.
