Note 30 — ERRATUM. p. 78, note 1, l. 19; for “were in orders, for the most part in holy orders;” read “were generally speaking in holy orders;”

Perfection was attributed, not only by medieval philosophers but also by Plato and Aristotle, to the circle. Circular movement was therefore the most perfect, and therefore again must be that of the planets. This is a good illustration of the almost necessary tendency in the earlier excursions of thought to equate incoordinates, and to fill gaps in reasoning from alien sources.