[37] [cap.8] And he has given to plants a nature which he has combined of as many powers as possible, that is of the nutritive, and the changeable, and the forming power; for they are nourished when they have need of nourishment; and a proof of this is that those plants which are not irrigated waste away and are dried up, as on the other hand those which have water supplied to them do visibly grow, for those which for a time were mere creepers on the ground, by reason of their shortness, suddenly spring up and become very long branches. And why need I speak of the changes which they undergo?