TEEPHINING. 



285 



trephine, or trepan, in various modified forms. There are also 

 others which may be considered as accessory, viz., scissors, bis- 

 touries, forceps, bone-scrapers and elevators. 



The brace and bit trephine is the original instrument vrhioh 

 has been more or less modified, and which, while it is capable of 

 more rapid execution, is probably less controllable than the ordin- 



FiQ. 299.— Bloliat's Trephine. 



Fig. 298 Old-FasMoned Trephine. 



Fig. 300.— Single-Handed Trephine. 



