62 EXPRESSION. 
tionable vapour which has already intruded; and 
forthwith we expire through both nostril and 
mouth. 
Resolution is expressed mainly by the mouth ; 
compressed lips indicating opposition to assault or 
entreaty from without, or the closing up of any ten- 
dency to yield from within. In the pout of discon- 
tent the angles of the mouth are drawn in as in all 
expressions of dissent, while the projection of the 
lips is in readiness for an expressive expiration ren- 
dered audible, it may be, by a labial ; just as, when 
the teeth and jaws take up the symbolic action 
instead of the lips, naturally syllables with dentals 
lie to hand. By what slight circumstances expres- 
sion of features may be modified is seen by the very 
different impression produced by a protruded and 
contracted mouth ready for an inspiration. 
Hitherto I have made little mention of the mus- 
cles of the forehead. What Mr. Darwin has written 
on the “grief muscles”* is exceedingly suggestive ; 
yet I own that, to my mind, it falls short of explain- 
ing the phenomena which he so graphically depicts. 
The frown expresses displeasure by the descent 
and gathering together of the two eyebrows, and 
so far is in perfect keeping with the principle of 
symbolic correlation which I have tried to give 
1Op. cit. p. 181. 
