=Antrum.=--Lift up the upper lip and examine the front wall of the antrum. The proper place in which to tap it is above the second bicuspid tooth, about one inch above the margin of the gum. 20. =Posterior nares.=--A surgeon’s finger should be familiar with the feel of the posterior nares, and of all that is within reach behind the soft palate. This is important in relation to the attachment of polypi, to plugging the nostrils, and to the proper size of the plug. In the examination of this part of the back of the throat it is necessary to throw the head well back, because, in this position, nearly all the pharynx in front of the basilar process comes down below the level of the hard palate, and can be seen as well as felt. But when the skull is horizontal, _i.e._ at a right angle with the spine, the hard palate is on a level with the margin of the foramen magnum, and the parts covering the basilar process are concealed from view. The head then being well back, introduce the forefinger behind the soft palate, and turn it up towards the base of the skull. You feel the strong grip of the superior constrictor. Hooking the finger well forwards, you can feel the contour of the posterior nares. Their size depends upon the anterior, but rarely exceeds a small inch in the vertical diameter, and a small half-inch in the transverse. The plug for the posterior nares should not be larger than this. Their plane is not perpendicular, but slopes a little forwards. You can feel the septum formed by the vomer, and also the posterior end of the inferior spongy bone in each nostril. 21. =Tonsils.=--Before taking leave of the throat, look well at the position of the tonsils between the anterior and posterior half arches of the palate. In a healthy state they should not project beyond the level of these arches. In all operations upon the tonsils, we should remember the close proximity of the internal carotid artery to their outer side. Nothing intervenes but the pharyngeal aponeurosis, and the superior constrictor of the pharynx. Hence the rule in operating on the tonsils, always to keep the point of the knife inwards. In troublesome hæmorrhage from the tonsils, after an incision or removal, it is well to know that they are accessible to pressure if necessary by means of a padded stick, or even a finger. 22. =Features.=--A word or two on the lines of the face as indicative of expression. Everyone pays unconscious homage to the study of physiognomy when, scanning the features of a stranger, he draws conclusions concerning his intelligence, disposition, and character. Without discussing how much physiognomy is really worth, there can be no doubt that it is a mistake to place it in the same category as phrenology, since the latter lacks that sound basis of physiology which no one can deny to the former.