BULL-HOLDERS AND LEADERS. 9 



preferable. The principle is similar to that above describfed, but 

 the distance apart of the two transverse pieces may be altered by 



Fig. 8.— Bull-holder. 



Fig. 9. — Bull-holder. 



means of a screw. Brogniez's gag has a semicircular bar, which con- 

 nects the horizontal branches resting in the interdental space of the 

 upper and lower jaws respectively, and which may be moved to either 



Fig. 10. — Nose-rinp' for bul 



Fig. 1 1. Fig. 12. 

 Bull-leaders. 



side. This gag has the disadvantage ot requiring to be very strongly, 

 and, therefore, heavily made, though it certainly leaves the mouth very 



