hard, firm growth, even reaching the size of a child's head.

A fibroma upon the larynx is not an infrequent occurrence in the ox. These
tumors are always sharply outlined and have a roughened surface. They may
be differentiated from actinomycotic tumors (see chapter on "Infectious
diseases of cattle," p. 358) in the same location by their firm, fibrous
structure and by the absence of pus from the interior.

A tumor is sometimes seen upon the muzzle of cattle, which assumes a
diameter equaling the width of the muzzle. It is a voluminous
connective-tissue formation known by the name of "fibroma diffusum."

Another form is sometimes observed upon the tongue. It grows upon a broad,
spreading base, becoming very hard. It is almost lacking in blood vessels,
although the few that are present are plainly in view, and in consequence
is poorly supplied with fluids. It is of a smooth contour, white or whitish
yellow in color, is sharply limited from the normal substance of the
tongue, may be covered with mucous membrane, on which prominent papillae are
located, or only by a thin, delicate layer of epithelium, and is usually
found in the middle part of the tongue, where it may reach the size of two
fists.

Pedunculate or stemmed fibrous tumors are frequently noticed growing upon
or near the extremity of the tails of cows. They are apparently of
traumatic origin, such as tying the tail fast while milking or shaving it
too closely while trimming for show purposes, and usually contain bloody or
gelatinous material within, or, again, they may be strongly edematous
throughout.

_Treatment._--The treatment of large fibromas is surgical and consists of
the operative removal of the tumor, followed by suturing of the wound.
Small external tumors may be painted with zinc chlorid, chromic acid, or a
concentrated solution of bichlorid of mercury.

PAPILLOMA (WART).

When fibromas develop from the lining or covering tissues they frequently
form papillary growths, more or less thickly covered with epithelium, and
are then called papillomas, or warts.

Papillomas consist of villouslike projections, resulting from a
proliferation of the outer layer (epithelium) of the skin or mucous
membrane. These growths are also called "angle berries," and may assume a
variety of forms. Sometimes there is a preponderance of epidermis in the
formation, and the tumor then appears as a hard, dense, insensitive,
clublike growth, or wart. Again the swell