ZEUXIPPUS. Well, our companion Plutarch himself presumably. asserted that he had heard somebody say that keeping the hands always warm, and never allowing them to get cold, is in no small measure conducive to health, and, conversely, the chilling of the extremities, by concentrating the warmth in the interior of the body, creates, as it were, a habit or a predisposition towards feverishness; and for a man to divert the substances in his body toward the surface, and to conduct and distribute them, along with the warmth, to all parts of his body, is healthful. Cf., 635 C. If therefore we happen to be doing something with our hands and using them, the motion itself brings the warmth to these parts, and keeps it there; but when not engaged in such activities we must by no means allow the cold to find lodgement in our extremities.