Ovarian sarcomata differ from the fibroid and the myomatous tumors in rapidity of growth, involvement of both ovaries, and the presence of ascites. Ovarian sarcomata may occur at any age. They are relatively very frequent in children. An analysis of 60 cases of ovarian tumors in children collected by Sutton shows that sarcomata occurred 16 times. The symptoms caused by ovarian fibromata, myomata, and sarcoma are those referable to pressure and peritoneal irritation. These tumors, on account of their moderate size and great mobility, seem to be especially liable to torsion of the pedicle. They should be removed by celiotomy as soon as recognized. Both ovaries should always be carefully examined, for in sarcoma the disease is often bilateral. =Carcinomata.=--Primary cancer of the ovaries is very rare. Secondary infection of these organs is, however, of not infrequent occurrence. It is found in cases of cancer of the breast and of the uterus. In 29 cases of death from cancer of the breast, both ovaries were found to be involved in 3 cases. Primary cancer of the ovary appears as a solid or a cystic tumor. The solid carcinomata are diffuse infiltrations of the ovarian tissue, forming pedunculated, rarely intraligamentous, ovoid or globular tumors having a smooth or slightly irregular surface. They are either of the medullary or scirrhous type. The medullary form is of rapid growth, and may reach the size of the adult head. The scirrhous form is of comparatively slow growth and smaller size, and in consistency resembles a fibroma. The cystic carcinomata are similar in form to the multilocular glandular cysts, but are smaller, rarely reaching a greater size than that of the adult head. They are adeno-carcinomata or papillary adeno-carcinomata. The surface of the tumor, its walls, and the septa contain to a greater or less extent solid nodules or plates of various size composed of carcinomatous tissue. The nodules often have a papillary character. Ovarian carcinoma is usually a bilateral growth. Unlike carcinoma in other parts of the body, it may, particularly the medullary form, occur in childhood. It is usually found between the ages of thirty and sixty years. Ascites is commonly present in cancer of the ovaries, the fluid being often tinged with blood; as the disease develops, edema of the lower limbs and cachexia appear. Cancer of the ovary is an extremely malignant growth, quickly extending to surrounding structures as implantations on the peritoneum, and by metastasis to distant organs. In more than 75 per cent. of the cases operated upon the disease has returned and terminated in death within the first year. When cancer of the ovaries is secondary to cancer elsewhere than in the uterus, operation offers no prospect of cure. If the disease is secondary to cancer of the uterus, it may be possible to remove all of the affected structures.