* OP THE ENCEPHALOID TUMOUR. 529 



The tuberculous matter, softened more or less completely, 

 into homogeneous pus, or into clotted pus, is evacuated by an 

 opening in the skin or mucous membrane; it is perhaps also 

 sometimes re-absorbed. Sometimes the collection remains in- 

 flamed, ulcerated indefinitely; at others it contracts and be- 

 comes obliterated ; sometimes the membrane of new formation 

 which lines it acquires a demi-mucous or demi-cartilaginous 

 texture, and constitutes a permanent dry fistula ; at others, 

 finally, a friable matter only is found, probably the residue of 

 a re-absorption, the tubercle not having formed an abscess. 



Vessels are never found in tuberculous masses: in the case 

 of tuberculous infiltration, the vessels being compressed and 

 obliterated, shortly disappear. The masses which are devel- 

 oped slowly have a soft or glutinous, cellular, cartilaginous, 

 and sometimes even osseous envelope. 



The tuberculous tissue is found in all the organs, and espe- 

 cially in the lungs; in the natural and accidental cellular tissue, 

 at the surface of serous membranes, but especially in their 

 false membranes, at the free surface of the mucous membrane, 

 and especially that of the intestine, in the lymphatic ganglions, 

 in the glands, in the spleen, in the bones, in the muscular tis- 

 sue, in that of the heart, in the encephalon and in the spinal 

 marrow, and in compound tumours. 



This morbid tissue has been observed in all vertebrate' ani- 

 mals. 



II. OF THE ENCEPHALOID TUMOUR. 



838. The encephaloid or cerebriform tissue is a very com- 

 mon morbid production: it has been confounded under the 

 name of cancer with several others, and especially with schir- 

 rus. Bayle and Laennec were the first who gave an exact de- 

 scription of it It is the medullary cancer, the fungous inflam- 

 mation, the* fungous hematodes of some English writer. 



This tissue exists under the form of denuded or enveloped 

 masses, and also under that of 'infiltration". 



In the state of crudity, it forms masses of various size; each 

 mass is lobed, lobulated, and the lobules are ordinarily turned 



