The _eburnated osteoma_ consists of dense osseous tissue. The lamellæ are arranged concentrically and parallel to the surface of the tumor. Blood-vessels and cancellous tissue are both absent. The tumor is of small size, rounded, globular or hemi-spherical in shape, and generally smooth, or slightly nodulated. 8. =Papillary Tumors.= The _Papillomata_ resemble in structure ordinary papillæ, and like these grow from cutaneous and mucous surfaces. They consist of a basis of connective tissue, supporting blood-vessels, which terminate in a capillary net-work, or in a single capillary loop, the whole being enveloped in a covering of epithelium, varying in character according to the surface from which the new formation springs. These growths are sometimes very vascular. On the skin we may have these growths as _warts_ and _horny_ growths. These are commonly firm, with a dense epithelial covering, and are less liable to ulceration and hæmorrhage, than those growing on other parts. But we have, in the _condylomata_ and _venereal warts_, occurring around the anus and upon the external male and female genital organs, instances of larger and more vascular forms on cutaneous surfaces. On the mucous membranes, the papillomata are softer and more vascular, and have a less dense epithelial covering. Many of them constitute so-called mucous polypi. They are met with on the tongue, in the larynx and nose, in the gastro-intestinal mucous membrane, on the cervix uteri, and in the bladder. 9. =Polypoid Tumors.= These growths occur exclusively in the mucous cavities of the body, and may attain a large size. They occur most frequently in the nose and the uterus, but are also met with in the ear, maxillary sinus, vagina and rectum, while their presence in the larynx and throat is exceedingly rare. They are usually solitary, varying in size and shape according to the locality which they occupy. Four varieties are met with, differing essentially in their structure. The _gelatinoid polypus_, the most common of all, occurs almost exclusively in the nose. It is of a jelly-like appearance, irregularly pyriform in shape, with a narrow pedicle, sometimes nearly an inch in length. It is nourished by a few straggling vessels, which are often of considerable length and thickness. The structure of the _fibrous polypus_ is exceedingly dense and composed of fibres, interlacing with each other in all directions. It is tough, hard and incompressible; of a reddish, purple or livid hue. It is nearly always solitary, may attain a large size, and is usually attached firmly by a broad base, and not by a pedicle. The uterus, nose and maxillary sinus, are its most common sites. The _granular polypus_, is of rare occurrence. It is met with chiefly in the uterus and in the ear. It is generally small, of a pale, greyish, or whitish color, soft and fragile in consistence, and globular, conical, or ovoidal in shape. Its structure is granular, homogeneous and inelastic.