EXPRESSION, 65 
upper and inner fibres directed toward the frontal 
eminence, while its outer fibres form the part of the 
muscle usually bearing the name. In antique 
statuary the line of action of the moveable attach- 
ment of this muscle is sometimes indicated by a 
depression rising upwards and outwards high on the 
forehead, while the gathered integument is com- 
paratively smooth. This is the actual line to which 
the action of the muscle can be traced on the 
living body in males with fleshy foreheads; and 
I have no doubt that this, unmixed with “ rectan- 
gular furrows,” was the outline of the horse-shoe 
of Sir Walter Scott in Redgauntlet, to which Mr. 
Darwin refers. When this line is drawn down- 
wards and inwards, the result will be to approach 
the upper attachments of the outer fibres of the 
Jrontalis so much to their inferior attachments 
that they will be deprived of the power of 
raising the eyebrow or wrinkling the forehead ; 
and this I believe to be the anatomical reason 
why the outer parts of the eyebrows are depressed 
while their inner ends are elevated in the joint 
contraction of /frontalis and corrugator muscles. 
On the other hand, the outer angles distinctly par- 
ticipate in the action when the brows are raised 
in expression of cheerful eagerness; and when I 
assume that expression I can feel that the occz- 
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