After how many manners may the Skull be fractur'd?
Three several ways, viz. by Contusion, by Incision, and by Puncture.
What is the most dangerous of these Fractures?
It is that which happens by Contusion; because the Concussion and Commotion is greater.
Do all the Fractures of the Skull require the use of the Trepan?
No, the Fractures must be deep which stand in need of the help of such an Instrument; for those that are superficial may be cur'd by a simple Exfoliation.
What is that deep Fracture, wherein the use of the Trepan is absolutely necessary?
It is that which is made in the two Tables of the Skull, penetrating to the Meninges of the Brain; upon which at that time the Blood is diffus'd, and must be taken away by the Operation of the Trepan.
How may it be discover'd that the two Tables of the Skull are broken?