Our author has neglected to make mention of the _halteres_ in this place, but recommends the exercise for the cure of elephantiasis. (iv, 1.) It is described by Galen, who says, it can be made to exercise the spine transversely. (De Sanit. tuend. ii, 11.) The exercise with them is thus described by Potter: “The exercise of leaping they sometimes performed with weights upon their heads or shoulders, sometimes carrying them in their hands; these were called ἁλτῆρες, which, though now and then of different figures, yet, as Pausanias reports, were usually of an oval form, and made with holes, or else covered with thongs, through which the contenders put their fingers.” (Antiquities of Greece, c. 20.) Mercurialis describes them as masses or weights of different materials, and of such a size as that they could be held in the hands. Ropes, too, he adds, were often fastened to them, to hold with. (De Arte Gymnast. ii, 12.) The Pythagoreans were fond of this exercise. (Iamblichus de Vita Pythagoræ, c. 21.) The _funambulatio_ consisted merely in scaling ropes, which, as we may suppose, was done in various ways. See Mercurialis (iii, 5), and Baccius (de Thermis, viii, 7.) The ἐκπλεθρίζειν, as Galen and Avicenna explain, consisted in running round the plethrum, or sixth part of the stadium, and always contracting the circle of one’s course, until one stopt in the middle. The πιτυλίζειν, as the same authors explain, consisted in walking upon one’s toes, and tossing one’s hands backwards and forwards. The _cricilasia_ appears to have been a large hoop, or circle, which was rolled on the ground. Even Mercurialis admits the obscurity of Oribasius’s description of it. (Med. Collect. vi, 26.) The _petaurum_ was a seat suspended by ropes, in which seat the person taking the exercise sat, and was tossed about by assistants. It is mentioned by Juvenal (Sat. xiv), and Martial (Epigr. xi, 22.) Antyllus thus describes the effects of _equitation_ on the human frame: “It strengthens the body, especially the stomach, more than any other mode of exercise; it clears the organs of the senses, and renders them more acute; but it is most inimical to the thorax.” Oribasius (Med. Collect. vi, 24), Pliny (Hist. Nat. xxviii, 4), and Aëtius agree with Antyllus as to the good effects of equitation on the stomach. Hippocrates and Cælius Aurelianus state that equitation is hurtful in disease of the hip-joint. All agree that riding on horseback is hurtful in diseases of the chest.