These cysts vary in size from a cherry to an egg, and consist of a double membrane containing a limpid fluid within which other hydatids may be found, of the same character as the parent cyst. They may excite inflammation and suppuration in the tissues around, and thus become discharged into the bronchial tubes, the pleural cavity, or through the diaphragm into the abdominal cavity. _Cystic_, _Fibrous_, _Cartilaginous_, and other forms of tumors, are occasionally found in the lungs, and, while they are generally small, they may acquire such size as to become a source of trouble during life. The Bronchial Tubes. The examination of the trachea and bronchial tubes in post-mortem examinations, is too frequently omitted. The lungs having been removed from the chest, they may be readily opened along their posterior aspect, and the bronchial tubes traced into the substance of the lungs. The pathological conditions of the bronchial tubes which may claim our attention, are _inflammation_ in its various forms, _obliteration_, and _dilatation_. =Bronchitis.= Bronchial inflammation has been divided into two varieties, according to the portion of the tubes affected. In one case the disease may be confined to the large and medium sized tubes; it is then known as _tubular bronchitis_. In the other, it is seated principally in the terminal ends, where the lining membrane is more delicate, and the tubes much smaller, and from this, extending to the air cells, forms what has been called _vesicular bronchitis_. The latter form is closely allied to pneumonia; in fact the two diseases pass into each other, and in most cases probably coexist. Ordinary, or _tubular bronchitis_, is not often a fatal disease, hence we cannot speak accurately of its anatomical characters; yet, being frequently associated with other forms of fatal disease, we have opportunities of examining it under those circumstances. The lining membrane is then found thickened, rough, of a dark red or brown color, with more or less contraction of the calibre of the tube, and covered with a viscid, jelly-like mucus, often streaked with blood, and in some cases of a puriform character. This form of bronchitis may occur as a primary disease, or it may accompany tubercular consumption; is frequent in cases of heart disease, and may arise in the course of typhoid fever, measles, scarlet fever, and small-pox.