And the use of the trephine, where the affected side can be distinguished.
He had been searching for two hours when he found the trephine.
A trephine is just like a corkscrew, only in place of the screw you have a cup of steel.
From Celsus too we learn that the trephine was driven by a thong.
Hippocrates, we have seen, uses the words and to denote the trephine.