communicated with the knee-joint, necessitating amputation of the limb. The very large museum connected with Guy’s Hospital is rich in hydatids. When, some time ago, I spent several days in going over the collection, I examined seventy-six preparations, representing apparently seventy separate cases of this affection. Amongst the noteworthy specimens one lung hydatid was intimately associated with a thoracic aneurism, two others being connected with the pleura; and of seven abdominal cases, five were connected with the peritoneum, one with the mesocolon, and one with the aorta. This last-mentioned instance occurred in a woman of sixty years, who, until her death, was treated for dropsy. She complained of incessant pain, which was only relieved when she rested on her hands and knees. Of the three cases affecting the heart one has been published (Mr Henderson’s), where the patient, a girl of nineteen years, died suddenly whilst in the apparent enjoyment of perfect health. In one of the other two cases (Mr May’s, of Tottenham), the left lung was also involved. One case of hydatid disease affecting the spinal column appears to have been originally an ordinary liver case. In Mr Cock’s example of genuine mammary hydatids, the hooklets and echinococcus heads were detected; but I am not sure that a similar result of microscopic examination was obtained in the equally interesting example of hydatids of the thyroid gland (also removed by Mr Cock). There are five bladder cases, all apparently genuine (of which one has been published); and there are also five other cases referred in the catalogue to the kidneys, of which I regard two as doubtfully parasitic in character. Of three cases of hydatid growths occupying the soft parts of the thigh, two were under Mr Bryant’s care. The museum likewise contains an old preparation of hydatids of the tibia, but its history has been lost. There are also two brain cases, besides upwards of a score of more or less characteristic and instructive cases of hydatids affecting the liver. Scattered amongst the museums connected with the larger provincial schools and recognised hospitals there must be a great many valuable preparations of hydatid disease; at all events, I judge so from the inspection I have incidentally made of a few of the collections. Of eleven preparations of human hydatids which I observed in the Cambridge Anatomical Museum, apparently representing the same number of cases, seven were connected with the liver and one with the lungs. Those hydatids displayed in the “special series” of entozoa were of uncertain seat. From the recently published and valuable ‘Notes’ by Dr Bradbury, I have no doubt that considerable additions have been made to the Cambridge Collection since my last visit.