sloughy appearance. There was great effusion of purulent matter, under the dura mater, investing the right hemisphere of the brain; the corresponding tunica arachnoidea was thickened and opaque; and between it and the pia mater there was considerable deposition of lymph and pus. The fungus was collapsed, of a dark colour, soft consistence, and connected with the anterior lobes; the surrounding cerebral matter was much softened, and mixed with pus. The fracture extended through the orbitar plate of the right os frontis, over which lay two small spicula of bone; and a similar fragment was situated over the right optic nerve. Many cases illustrating the danger of punctured fracture might be related, but are unnecessary, inasmuch as they would lead to the mere repetition of such facts as have been already stated. Fracture of the external table alone must be rare, but we occasionally see in museums specimens exhibiting a small portion of the outer table driven into the subjacent cancelli, without any fracture of the inner table. This kind of injury belongs entirely to that period of life in which the diploe is of considerable thickness. The treatment would of course be simply that adapted to contusion or concussion. It is also possible for a blow on the head to produce fracture of the brittle inner table, the outer table remaining entire. However uncommon such a form of injury may be, as its effects may possibly be very serious, it is right to bear it in mind. A splinter of the inner table thus driven into the dura mater might cause violent symptoms and even death.