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It is characterized by caseating nodular swellings, first of the skin and afterwards of the superficial lymphatic vessels and glands, finally proving fatal within a year by extension to the viscera.

The primary lesion is either a caseating focus in one of the bones—most often in the upper end of the humerus—or it is of the nature of caries sicca.

In the case of caseated glands in the neck, for example, it is obvious that the removal of this inert material is necessary before the tissues can be irrigated with fluids of high bactericidal value.

They are like the grill age one notes in ancient French country houses—little caseate cut in the windows through which you may see in vivid outline a little section of the landscape.

A caseating ferment is supplied by the bacilli, and this, acting upon the fibroid patch, transforms it into a dry, finely granular, yellowish mass of tissue detritus resembling cheese.