CLASSIFICATION. 411 



or indifferent tissues, but in which there may be— always abor- 

 tive — some attempts at higher develo^jment : — 



Spindle-celled sarcoma. 



Small spindle-celled sarcoma. 

 Large „ „ 



Osteoid sarcoma. 

 I Myeloid 



r Small round-celled sarcoma. 

 Piound-celled sarcoma, . < Alveolar sarcoma. 

 I Melanotic sarcoma. 



Parasitic sarcoma, . , Actino-mycosis. 



2. — Ujnthclial Tumours, consisting not only of MesoUastic, hut of 

 Epihlastic and Hypoblastic elements in addition. 



On section these tumours are seen to consist of a dense basis 

 membrane — cancer stroma — built of reticulated bands and tra- 

 l)eculae, and containing within its areolae a substance of a softer 

 and different consistence, often in the form of a milky juice — 

 cancer juice. They are classified as the carcinomata, which in- 

 clude the four following varieties, namely — 1. Scirrhous; 2. 

 Medullary or Encephaloid ; 3. Colloid ; and 4. Epithelioma. 



In addition to these two great groups we have cystic tumours, 

 found in various parts of the body, due to the dilatation of ob- 

 structed ducts, the embryonic forms of parasites, and to acci- 

 dental causes, as seen in the endothelial cysts, found around 

 tendons, serous abscesses, &G. 



