Note 788 — ON INJURIES OF THE HEAD.

This third mode of fracture is thus defined by Celsus: “At ubi medium desedit, eandem cerebri membranam os urget; interdum etiam ex fractura quibusdam velut aculeis pungentibus,” (viii., 4.) Hippocrates, it will be remarked, makes no mention of spiculæ in his description of depression. Galen describes two varieties of depression; in the one the depressed portion retains its situation, and in the other it rises again to its former level. (De Caus. Morb.) Hippocrates does not appear to have been acquainted with the latter. Modern experience has shown that it sometimes occurs in children.