This form of pneumonia being frequently associated with diseases of the joints and bones, as well as with inflammation and ulceration of the glands of the intestines, it has been considered as depending upon a strumous diathesis, and as, in fact, but the early stage of tubercular consumption. Seldom proving fatal in the early stage, or before the disease has extended to the whole substance of the lung, and perhaps resulted in the formation of cavities, we much less frequently meet with this form of pneumonia in post-mortem examinations. =Suppuration and Abscess.= Gray hepatization must be looked upon as a form of _suppuration_ of the lungs; as the purulent-looking fluid found infiltrating the tissues, filling the air cells and smaller bronchial tubes, upon a microscopic examination, is found containing undoubted pus globules. This, however, is not an abscess, the matter not being confined within a cavity, but diffused through the tissues of the part. That a distinct abscess of the lungs may form, as a result of pneumonia, is generally admitted, though they are usually small and confined to the lower lobes. From softening of tubercular masses, abscesses not unfrequently form in any portion of the lungs. That they do not occur more frequently in pneumonia, may result from the fact that the disease often proves fatal by suffocation, before there has been time for it to have reached the suppurative stage. The pleura over the seat of the abscess will generally be found much thickened, and frequently adherent to the opposite walls of the chest. Pulmonary abscess may be wholly discharged by expectoration—the cavity communicating with the bronchial tubes—or it may discharge into the pleural cavity, or when adhesions have first formed, it may work its way between the ribs, and the matter escape upon the surface of the body. =Metastatic or Secondary Abscess.= This form of abscess in the lungs, is well understood to be the result of suppuration in some distant part or organ, which, being attended with phlebitis of the part, purulent matter is introduced into the circulation, and thus conveyed to the lungs or perhaps the liver. This original suppuration may be at the uterus after delivery, or from a fistulo in ano, psoas abscess, or any other similar affection. From the fact, probably, that the whole volume of the blood flows through the lungs, at each round of the circulation, these organs are more frequently affected with this form of abscess than any other, it occurring next in frequency in the liver. These abscesses may be recognized as spots of yellow pus, varying in size from a pin’s head to a walnut, generally situated near the surface of the organ and surrounded by a dark, well defined layer of congested tissue, while beyond this, the structure is in a healthy condition. Several of such abscesses may be found in various parts of the lungs.