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It is usually of the nature of a glio-sarcoma and is highly malignant. #Endotheliomas# take origin from the endothelium of lymph vessels and blood vessels, and serous cavities.
The pleura is not much reddened, but by its thickness in some points, its adhesion in others, and the effusion of a serous fluid, it proves how much and how long it has participated in the inflammatory action. The trachea and the bronchia are slightly red, and the right side of the head is gorged with blood.
The streptococci are found most abundantly in the lymph spaces just beyond the swollen margin of the inflammatory area, and in the serous blebs which sometimes form on the surface. #Clinical Features.# Facial erysipelas is the commonest clinical variety, infection usually occurring through some slight abrasion in the region of the mouth or nose, or from an operation wound in this area.
We know as well what differences to expect in the habits of a mucous and of a serous membrane, as what mineral substances to look for in the chalk or the coal measures.
Such an ulcer has an elevated border, sharply cut edges, an indurated base, and exudes a scanty serous discharge; its surface is at first occupied by yellow necrosed tissue, but in time this is replaced by smooth, pale-pink granulation tissue; finally, epithelium may spread over the surface, and the ulcer heals.
The most important ones are the skin, which covers the entire external surface of the body; the mucous membrane, which lines all the cavities that communicate by openings with the external surface; and the serous membrane, which, including the synovial membranes, lines all the closed cavities of the body.
An elevated temperature singularly favours the eruption, and also renders it confluent and of a serous character. A cold atmosphere is unfavourable to the eruption, or even prevents it altogether. Death is almost constantly the result of the exposure of dogs having small-pox to any considerable degree of cold. A moderate temperature is most favourable to the recovery of the animal.
The desiccation and the desquamation occupy an exceedingly variable length of time; and so, indeed, do all the different periods of the disease. What is the least inconstant, is the duration of the serous eruption, which is about four days, if it has been distinctly produced and guarded from all friction.
The walls of the stomach are formed by four coats, known successively from without as serous, muscular, sub-mucous, and mucous. The second coat is muscular, having three sets of involuntary muscular fibers. The outer set runs lengthwise from the cardiac orifice to the pylorus. The middle set encircles all parts of the stomach, while the inner set consists of oblique fibers.
Rupture may take place through the skin, on a mucous or serous surface, or into the cellular tissue. The first hæmorrhage is often slight and stops naturally, but it soon recurs, and is so profuse, especially when the blood escapes externally, that it rapidly proves fatal.
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