The most frequent and important of these are tubercle and cancer.

1. Formation Of Cysts

This is of very rare occurrence, more especially when we except the formation of cysts in the lymphatic glands in association with cancer. Varicosities of the lymphatics in the glands must not be confounded with cysts, as was formerly done, nor must they be mistaken for the apertures which are occasionally observed in the stroma of the impoverished parenchyma of atrophied glands. There is an old preparation in our Museum, in which the glands of the lumbar plexus have degenerated into tumors of the size of a pigeon's or hen's egg, and which appear like a convolution of somewhat large sacs, intermixed together, and having comparatively thick walls. It is impossible to form a correct idea of the nature of these cyst-formations.

Sacs having purulent, cheesy, and greasy contents, or which are filled with a chalky paste, and are occasionally incrusted with mortar-like walls, are obsolete abscesses - tuberculous caverns.

2. Black Pigment

Large accumulations of this substance frequently occur, as is well known, in the bronchial glands. It is also occasionally found, in smaller quantities, in the mesenteric glands, and even in other lymphatic glands. The bronchial glands are often so swollen with this substance, that they appear like considerable, inky, tough tumors. It is the residuum of the haematin, which has been deposited in the course of hyperaemia and inflammation of the glands. The blackness of the bronchial glands, is associated with the well-known accumulation of pigment in the parenchyma of the lungs, and it is supposed that a part of the pigment here formed is absorbed by the lymphatics, and deposited within the bronchial glands. The black color of the mesenteric glands coincides with the discoloration of the mucous membrane round the apices, and supposed openings of the excretory ducts of the solitary and agmi-nated gland-capsules, and with the blackened appearance of the intestinal villi. It is particularly marked after typhous congestion and inflammation.