4. =Lipomatous Tumors.= The _Lipomata_ or fatty tumors are very common, and may occur in any part of the body. There may be but one, or they may appear in very large numbers in different parts of the body. They sometimes attain an enormous size. They are lobulated, and are usually surrounded by a fibrous capsule, which separates them from the adjacent structures. Their consistence varies according to the amount of fibrous tissue that enters into their formation. They frequently become pedunculated, or assume a pyriform shape, no doubt by reason of their weight, by which they are gradually dragged out of their original shape, as well as position. They resemble in structure, as also in appearance on section, adipose tissue. They consist of more or less round or polygonal cells, distended with fluid fat, and united into masses or lobules of various sizes by connective tissue, which also forms a sort of capsule around the tumor, and connects it more or less firmly to the parts around. Inflammation, suppuration, ulceration, and even gangrene may occur in these growths. They may also undergo at certain points, fibrous, cartilaginous or osseous degeneration. Cysts filled with various kinds of substances may also occasionally occur within them. 5. =Fibrous Tumors.= The _Fibromata_ appear in very different parts of the body, commonly in those which normally contain much fibrous tissue. Several may exist in the same organ, more particularly in the uterus, rarely do they coexist in separate organs. Their form is mostly spherical, generally with a smooth, even surface, although not unfrequently it is lobulated, or marked by numerous elevations and depressions. They feel heavy and incompressible. Near a free surface they are prone to become pedunculated. They may attain a very great size. Their vascularity is in proportion to the density of their structure, some having but few vessels, while others are highly vascular. A distinct capsule is but seldom met with, although the tissues around the tumors will usually be found a great deal condensed and thickened. They consist essentially of fibres, resembling those of areolar tissue. “Sometimes the fibres are tolerably distinct and separate, more often so interlaced and blended together, or so imperfectly evolved that they cannot be made out as such. Yellow elastic fibres are not unfrequently mingled with the white.” Growths of this kind are not, in general, liable to any great degree of change. Inflammation, with injection and softening of the part may take place. Cretification may occur, by which either the whole tumor may be converted into a calcareous mass, or only the outer stratum surrounding the rest as a kind of shell.