In the illustration the parts are as follows:-- (1) Lateral view of a prepared cranium representing the iron bar traversing its cavity.
(2) Front view of same.
(3) Plan of the base seen from within.

In these three figures the optic foramina are seen to be intact and are occupied by small white rods.
(4) Cast taken from the shaved head of the patient representing the appearance of the fracture in 1850, the anterior fragment being considerably elevated in the profile view.
(5) The iron bar with length and diameter in proportion to the size of the other figures.
Heaton reports a case in which, by an explosion, a tamping-iron was driven through the chin of a man into the cerebrum.

Although there was loss of brain-substance, the man recovered with his mental faculties unimpaired.

A second case was that of a man who, during an explosion, was wounded in the skull.

There was visible a triangular depression, from which, possibly, an ounce of brain-substance issued.