(Chapter 25) Footnote 23:

See Galen, op. cit. 3.125.16ff.: “to protect the [carpal] system completely, it was better for it to consist of many bones, and further, of bones just as hard as they are; for by yielding at the joints to objects striking against them, they break the force of the blows. It is in just this way that a dart or spear or any other weapon of the sort pierces a stretched hide more easily than one not under tension, because the one offers resistance and the other by yielding a little deadens the force of the blows falling upon it.” (tr. May 1968, p. 133).