e tissues of special
function and simple connective tissues. The lining or covering tissues,
both internal and external, are known as epithelium.

Section A of the table below contains the true tumors or proper neoplasms.

Section B includes the cysts, some of which are true tumors, while others
are false ones, but the latter are added because of their gross resemblance
to the true and the consequent necessity of considering them at the same
time.

TUMORS AND CYSTS.

A.--Tumors.

BENIGN.

I.--_Tumors composed of tissues resembling those of special function._

1. Type of muscle tissue Myoma.
2. Type of nerve tissue Neuroma.
3. Type of vascular tissue Angioma.
4. Type of gland tissue Adenoma.

II.--_Tumors composed of fully developed connective tissue._

1. Type of fibrous tissue Fibroma.
2. Type of adipose, or fat, tissue Lipoma.
3. Type of cartilage tissue Chondroma.
4. Type of osseous, or bone, tissue Osteoma.
5. Type of neuroglia, or nerve, sheath Glioma.
6. Type of mucoid, or mucous, tissue Myxoma.

MALIGNANT.

III.--_Tumors composed of embryonic or immature connective tissues._

1. Type of immature connective tissue Sarcoma.
2. Type of endothelial tissue Endothelioma.

IV.--_Tumors in which epithelial elements predominate._

1. Type of various epithelial cells and associated tissues Carcinoma.

B.--CYSTS.

I.--_Cysts which develop in preexisting cavities._

1 Retention cysts.
2 Proliferation cysts.

II.--_Cysts which are of congenital origin and are true tumors._

1 Dermoid cysts.

III.--_Cysts which originate independently as the result of pathological
changes and are nontumorous._

1. Cysts formed by the softening and disintegration of
lesions Softening cysts.
2. Cysts formed around parasites Parasitic cysts.
3. Cysts form