TUMOURS. 



EXPLANATION OF PHOTO-LITHOGRAPH, PLATE IV. 



1. Malignant Epulis. — Mouth of ox. The microscopic characters 

 of this tumour are given at page 419. The cells, as wiU. be seen by the 

 microscopic drawing, Fig. 99, partake of the nature of epithelial cancer. 



2. Benign Epulis. — Mouth of sheep. Microscopically, the struc- 

 ture of this tumour is fibrous. 



3. Epithelioma. — Tongue of ox. The true nature of the growths 

 are not definitely made out. 



4. Medullary Cancer. — The tumour was originally roundish in 

 form ; distinctly separated from surrounding structures, and invested 

 in a capsule of a semi-fibrous nature. The section shows various de- 

 generative changes which have taken place within its substance. The 

 tumour was removed by me from near the stifle-joint of a mare at 

 Berwick-on-Tweed. It weighed four pounds, and, along with other 

 masses of a similar character removed from the mammary gland and 

 submaxillary space, made up an aggregate mass weighing 31 lbs. The 

 mare died some time after the operation, and a post mortem examina- 

 tion revealed many other cancerous tumours in various internal organs. 

 The microscopic characters of this tumour are represented in woodcuts. 

 Figs. 95, 96, and 97, page 418. 



5. Medullary Cancer of the Tail (not melanotic), showing the 

 arrangement of its several masses ; on the left the tumour has ulcer- 

 ated. Kemoved by me from a cab-horse ; no return of the disease. 



6. Medullary Cancer of the Bones op the Face of the Ox. — 

 (1.) Large tum^'or. (2.) Cystic formation within the superior maxil- 

 lary sinus. (3.) (4.) and (5.) Smaller medullary tumours. 



7. Osteo-Sarcoma of Ox. — The specimen having been boiled, the 

 sarcous matter is removed, the bony trabeculse alone remaining. 



8. Cystic Growth in superior maxillary sinus of a year-old colt. 

 (1.) The cyst. (2.) Fifth and sixth molar teeth uncut. (3.) Fourth 

 molar on the point of " cutting." (4.) Worm-eaten fangs of tem- 

 porary molars undergoing absorption. 



9. Dentigerous or Tooth Tumour, containing several hundred 

 rudimentary teeth, filling the antrum (2.), and extending from it into 

 the cavity of the mouth (1, 1). 



10. Large Nasal Polypus. — (1.) The tumour. (2.) Anterior naris. 



