=TUMORS.=--A tumor--in its original meaning--signifies a swelling. As commonly used it means a new growth or enlargement of a part, which is not due to injury or inflammation. Tumors occur at all ages, in both sexes, and may attack any part of the body. Tumors are usually divided into benign and malignant growths. In a general way the malignant tumors are painful; they do not move about freely but become fixed to the adjacent parts; their growth is more rapid; they often have no well-defined borders; frequently they return after removal; the skin covering them is often attached and cannot be moved readily without also moving the tumor. Malignant tumors are divided into cancers (carcinomata) and sarcomas (sarcomata). Cancer is much more frequent than sarcoma. Cancer occurs more often in persons over thirty; there appears to be a hereditary tendency to it in some families, and a number of individuals in the same house or locality sometimes develop cancer as if it were in some way communicated from one to another. The common situations of cancer are the breast and womb in women, and the lip and stomach of men. The neighboring glands become enlarged, as are shown by the lumps which form under the jaw in cancer of the lip, and which may be felt sometimes in the armpit in cancer of the breast; these are, however, late signs, and the growth should never be permitted to remain long enough for them to develop. Paleness, weakness, and loss of strength often attend the development of cancer, but many do not exhibit these symptoms. Sarcoma is often seen in the young and well nourished; it grows very rapidly; the skin is usually not adherent to the tumor; there is generally no pain; heredity has no relation to its development; paleness is absent in many cases; the favorite seats are the muscle, bone, glands of neck, brain, and many other localities; it is not nearly so common as cancer.