An Attempt to determine with Precifion fuch INJURIES of the HEAD® 
as neceffarily require the OPERATION of the ‘TREPHINE. By 
SYLVESTER O’HALLORAN, £/; M.R. I. A. Honorary 
Member of the Royal College of Surgeons in Ireland, and Sur+ 
geon to. the County of Limerick Hofpital.. 
Non jingindum, aut excogitandum, fed inveniendum, quid natura’ 
faciat auta ferat.. BACON. - 
WeERE we to eftimate the lights thrown on particular” 
diforders by the number of eminent men who have treated 
of them, we would conclude that thofé produced by external 
injuries of the head muft be beft underftood,-as from the 
days of Hippocrates to our own they have been’ confidered - 
with moft particular attention. But however*great our obliga-- 
tions to our anceftors, and to many illuftrious- and learned: 
moderns and contemporaries, may be, yet our knowledge of this 
fubject, fo interefting to mankind, is {till incomplete. The va- 
rious diforders fubfequent to injuries on the head have by no 
means been difcriminated with fufficient precifion; nor have 
their fymptoms or modes: of treatment -been clearly afcertained; . 
even - 
