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SELECTION AND AKRANC.EMENT OF TEETH. 29

The teeth in cicchision ha\e held the jaws at a certain
position recognized as normal, in whicli the niasseter and
temporal muscles which close the mouth are still cap-

FlG. II.

able of vigorous action. These muscles are much stronger
than those which act in opening the mouth. With the
loss of the teeth the prop which stopped the lower jaw short