The ἀκροχειρισμὸς is thus described by Scaliger: “Est autem ἀκροχειρίζειν luctæ pars, cum primoribus tantum digitis insertis roboris faciunt periculum.” (Poet. i, 22.) Suidas explains it thus: “A man taking hold of his antagonist’s fingers, strove to break them, and did not give over until he compelled him to yield.” The term occurs in Aristotle. (Eth. Nicom. iii, 1.) See also, Athenæus. (Deipnos. iv, 13.) It is called ἀκροχέιρισις by Hippocrates (De Diæta. ii, 42), who says it reduces the body. The exercise with the κώρυκος, or leather bag, is described by Oribasius in the following manner: A bag filled with flour or sand was suspended from the top of the house, on a level with the navel; it was then pushed forwards with the hands to the extremity of the rope, and, as it recoiled, the person performing the exercise retreated backwards, so as to escape from it. (Med. Collect. vi, 33.) This exercise is mentioned by Hippocrates. (De Diæta, ii.) Cornarius and the translator of Hippocrates confound it with the _follis_ of the Romans; but Mercurialis clearly shows that they were quite different. The _follis_ was a leather ball, inflated with air; such is the description of it by Cælius Aurelianus: “Follis erat pila magna ex aluta confecta, soloque vento repleta.” Martial represents it as a becoming exercise for boys or old men: “Ite procul juvenes, mitis mihi convenit ætas, Folle decet pueros ludere, folle senes.” (Epigr. xiv, 45.) They were different from the _pila magna_ and _parva_; that is to say, the large and small ball. These balls were of different sizes, and were played with in various ways. They are minutely described by Oribasius. (Med. Collect. vi, 32.) See also Horace (Sat. ii, 2), and Martial (Epigr. iv, 15.) See a most learned and accurate account of all these sports in Mercurialis. (De Arte Gymnastica, ii, 4.) Galen has written a treatise on the exercise of the parva pila. To this class of exercises we may refer _the pitching of a stone_, which is mentioned by Avicenna.