appear to have been cotemporaries. * In an appendix to his 
Microcofmographia, he gives the figure of three-and-fifty inftru- 
ments of chirurgery, after that of the trepan, (which, with all 
the others, is copied from Ambroife Paré, as acknowledged in his 
title page) he gives a figure of another fort of trepan or trafine, 
as in general ufe then amongft the London Chirurgeons; it 
exactly. refembles that of John Woodall, and is thus defcribed, as 
called the hand-trepan. “ The head of which is made taper 
“ fafhion, fmaller at the teeth and greater upwards, with cutting 
“ edges round about on the outfide, to make way for itfelf, the 
“ fhank of the head entereth into the focket of a flraight ftemme 
“ and is made faft into it with a fcrew, the handle is made crofs 
“ the top of the ftemme, like the handle of a gimlet, but larger, 
“© and both fides made in the form of an elevatory ; this, he fays, 
“ with a femicircular motion of the hand, performeth the opera- 
“ tion with great fecurity, for the perforation being made it 
“* cannot flip in to endanger the hurting the dura-mater, as the other 
“© may do.” 
In tracing the progrefs of the two infiruments now in ufe for 
perforating the fkull, we find that the trafine was introduced 
into practice in England in the laft century, and fucceeded to 
the trepan in its improved ftate ; and though for fome years paft 
the trephine has been generally ufed by the Englifh Surgeons, | 
. yet, as | mentioned before, Mr. Bell has given a decided prefer- 
_ence to the trepan, and has by his recommendation endeavoured 
to recal it into practice. His words are, “ + If the trephine is em- 
di lyr; “ ployed 
* Appendix to, Crooke’s Microcofmographia,. Ghap: I7, page, 25. 
+ Bell’s Syftem of Surgery, Vol. 3, page 77. 
