In the north of Europe similar discoveries have been made. At Borreby, in Denmark, a skull was found from which large pieces had been taken; and another from beneath a dolmen at Noes, in the island of Falster, had a hole in it no less than two and a quarter by one and three quarter inches in size. In the one case the holes were parts of a wound to which the victim had succumbed; in the other the edges were too regular to have been caused by traumatism. A Russian skull, a cast of which has recently been presented to the Italian Anthropological Society, bears traces of two trepanations; one performed during life, the other after death. The former had evidently been caused neither by illness nor by a wound. General Faidherbe discovered at Roknia, in Algeria, two trepanned skulls, dating from a remote antiquity, in one of which the wound is half an inch in diameter, and shows no sign of cicatrization; and travellers speak of evident traces of similar operations on skulls dating from the time of the Aïnos, the ancestors or predecessors of the Japanese at the present day; and if we cross the Atlantic, we shall meet with instances of trepanations executed in a similar manner, and probably for similar reasons. We meet with numerous examples of trepanation in America, and fresh discoveries are daily made by the energetic men of science in that country. Dr. Mantegazza28 mentions three examples of trepanation from Peru, which are of very great interest. One skull, still bound up in many cloths, was found in the Sanja-Huara Cave (province of Anta), which had been twice trepanned, and on which yet two more attempts at trepanation bad been made. The latter seem to have taken place at different times, and death seems to have succeeded the last operation. Another skull which had belonged to an adult of Huarocondo has two frontal openings close to each other; the upper, of elliptical shape, is of large size and was evidently made after death. Yet another skull from the province of Ollantay-tambo bears a double trepanation, evidently made during life. The healing of the parietal opening proves that it was made before the wound in the forehead, in which the edges have remained rough. Dr. Mantegazza thinks that in the two first cases the operations took place after the patient had been wounded, but that in the third, the patient operated upon bad been epileptic or perhaps even insane. We find it difficult to follow the learned professor here, as w e are ignorant of the grounds for his conclusions.