TUMOURS. 85 



ture. The animal eats slowly and with difficulty, it is in 

 consequence in a lean and unthrifty condition. 



" The last case of M. Macrops which is recorded at length, 

 had been previously treated by three veterinary surgeons 

 without success, and was about to be slaughtered as incurable 

 when it fell into his hands. 



" After securing the animal properly, a crucial incision was 

 made over the tumour, and the skin raised from the osseous 

 parietes, to which it was firmly adherent. The outer plate 

 of the cranium was then found to be attenuated by the pres- 

 sure of the foreign body. By means of pincers and a knife a 

 sufficient amount of this was removed to allow of the intro- 

 duction of a strong instrument beside the dental tumour. 

 By this instrument pressure was effected on the tumour in 

 different directions, always avoiding any measure calculated 

 to cause pressure on the brain, and, after some difficulty, 

 the offending body was removed, leaving a deep cavity with 

 smooth edges. 



" M. Macrops has always found these fistulse dependent on 

 a similar cause, and in all the cases operated on by him, the 

 crown of the tooth has been turned towards the cranium. 



"Out of fourteen horses on which the same operation was 

 performed, thirteen were completely cured in the course of 

 from ten to fifteen days. The fourteenth was twice operated 

 on, with an interval of three months, and at each operation 

 a similar tumour was extracted. After the second operation 

 there still remains a soft, encysted tumour, of the size of a 

 small egg, from the inner surface of which is secreted a 

 transparent albuminous fluid. When the tumour is full, the 

 liquid escapes by a very delicate canal, opening opposite the 

 middle of the ear. All means resorted to for the cure of tnis 

 cyst have failed, the injection of tincture of iodine, the ap- 

 plication of the hot iron to its inner surface, and the passage 



