D. The HOLE, or Foramen oF THE EAR; a little below this, is the mastoid process of the temporal bone.

E. The PARIETAL BONE, so called, because it forms the greater part, as it were, the wall of the skull.

F. The OCCIPITAL BONE.

These bones are united by sutures, in which the processes of the bone as they grow, seem to run out, and indent themselves into the opposite bone, without there being an absolute union betwixt them. That which unites the frontal bone, and parietal bones, is called the coronal suture; that which we see here uniting the parietal bone, and temporal bone, is called the squamous or temporal suture. The line which is betwixt the occipital and parietal bones, is the lambdoidal suture; lastly, the union of the parietal bones is called the sagittal suture, because it is laid betwixt the lambdoid and coronal sutures, like the arrow betwixt the bow and the string.

There are many lesser sutures which unite the smaller bones of the face, but they need not be mentioned here.

G. The CHEEK BONE (os malæ).

H. The Upper Jaw Bone (or os maxillare).

1. The BONES OF THE NOSE (Ossa nasi).

K. The LOWER JAW (inferior maxilla).

L. The ANGLE OF THE JAW.

M. The PROCESS OF THE JAW which moves in the socket in

the Temporal Bone.

N. The CORONOID PROCESS OF THE JAW into which the temporal muscle is fixed, to move the jaw in conjunction with other muscles.

Fig. 3. Represents the Skull of a Child at Birth, in which the sutures are not yet formed, the bones of the cranium being loose, and attached by their membranes only. While spaces may be observed, left unprotected from the imperfect ossification of the

bones.

The individual parts require no references; they will be sufficiently understood from their correspondence with fig. 2.

Fig. 4. Is a Section of the Cranium, in which the only thing meant to be particularly remarked, is the cavity which is to be observed in the frontal bone, viz. The frontal sinuses.

EXPLANATION

OF

PLATE VI.

THESE Outlines are in explanation of the VII. and VIII. Essays p. 149, and p. 167.

Figs. 1 and 2. Are Marginal Illustrations of Albert Durer. A pretty decisive proof that he understood the theory of the facial line.

Figs. 3 and 4. Are from Camper, intended by him to illustrate the effects of inclining the fascial line forward in approximating the form of the head to the antique, but which I have copied here, to prove the very reverse. For while the individual features bear the character of vulgar or common nature, they are not improved by giving them the general proportions of the antique head.

F F