OPERATIOiYS ON THE SKULL, FACE, LLPS, ETC. 



89 



the bone carefully removed by cutting or scraping. A hole, 

 intended for the insertion of the central pin, is bored with a 

 gimlet in the middle of the spot to be operated upon, and 

 the trephine applied. This instrument is worked steadily 

 and carefully to and fro in a rotator\- manner with gentle 

 pressure until it is felt to have almost penetrated the bone. 

 One side is then slightly depressed in order to cause the 

 piece of bone in the trephine to become elevated on one 

 side, and so attach itself to the instrument when the latter is 



Fig. 61. — Granuloma of the Nose. 



withdra\\'n, instead of falling into the cavit\' underneath. 

 The foreign bod}- is then sought for, or the purpose of the 

 operation accomplished, the skin afterwards being sutured 

 over the part, and the whole covered with antiseptic 

 dressings (see p. 3) and bandaged, or left open, according 

 to the discretion of the operator. 



Tumours on the Nose. 



Tumours on the outside of the nose are not common, but 

 theA- are occasionall}- met with, as is shown by Fig. 61. 



Treatment. — They are treated like tumours in other situa- 



