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They usually take the form of unilocular or multilocular cysts, the wall of which contains skin, mucous membrane, hair follicles, sebaceous, sweat, and mucous glands, nails, teeth, nipples, and mammary glands. The cavity of the cyst usually contains a pultaceous mixture of shed epithelium, fluid fat, and hair.

In the smoking-room is to be seen a remarkable chimney-piece of carved marble, which once stood in Fonthill Abbey, the house of the author of Vathek. To the antiquarian, perhaps the most interesting objects are four funeral cysts, dating from two thousand years ago.

This lump had air-tubes running through it, which were not yet cut off by suppuration; and in one place, the cyst was perforated by a bronchial tube, letting in the external air to the lump, which was undergoing disorganization, and swelling badly. When cut into, it did not present the red, mottled, organized appearance of those cases with air-tight cysts.

In a case of Sangster, reported by Politzer, although most of the dermoids, as usual, were like fibroma-nodules and therefore the color of normal skin, those over the mastoid processes and clavicle were lemon-yellow, and were generally thought to be xanthoma until they were excised, and Politzer found they were typical dermoid cysts with the usual contents of degenerated epithelium and hair.

But a bee's tongue, delicate as it is, would crush a fragile plant louse. I picked another burr, squeezing it gently, when there issued from the hole at the base a drop of crystal-clear liquid, held in the thinnest of envelopes, which I tasted and found sweet. In burr after burr I found these sacks or cysts of sweets secreted by the aphides for the bees to puncture and drain.

Fetal adenoma, which is a formation of gland tissue from the remains of fetal structures in the gland; 3. Gelatinous or interacinous adenoma, which consists in an enlargement of the acini by an accumulation of colloid material, and an increase in the interacinous tissue by a growth of round cells. It is this latter form in which cysts are frequently found.

Exudation cysts arise from the distension of cavities which are not provided with excretory ducts, such as those in the thyreoid. Implantation cysts are caused by the accidental transference of portions of the epidermis into the underlying connective tissue, as may occur in wounds by needles, awls, forks, or thorns. The implanted epidermis proliferates and forms a small cyst.

On May 3d abdominal section was performed. An incision eight inches long was made in the mid-line of the abdomen. A cystic tumor, formed of small cysts in its upper part and of somewhat larger ones in the lower part, was revealed. It was adherent to the abdominal wall, liver, spleen, and omentum.

Thrombi usually originate in venous cysts or pouches, and at acute bends on the vessel, especially when these are situated in the vicinity of the knee, and are subjected to repeated injuries for example in riding. Phleboliths sometimes form in such pouches, and may be recognised in a radiogram.

On dissection, such a tumour is found to contain a curious mixture of tissues bones, skin, and portions of viscera, such as the intestine or liver. The question of the removal of the tumour requires to be considered in relation to the conditions present in each individual case. Cysts which form in relation to new-growths have been considered with tumours.