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j. Here a!fo the Zygomaticus major affifls, in draw- 
ing the Corners of the Mouth upwards. There 
are many who open their Mouths very wide in 
laughing and then the 
4. SDigajtric Mulcle, and the LatiJJlmus Colli ad in 
pulling down the lower Jaw ; and in fome Per- 
ions who laugh heartily, the Mufcle call’d the So* 
chis pyramidalis is drawn into Confent* and, by 
its Contraction wrinkles the Skin of the Nofe. 
Prom this Explanation it may be inferred, that the 
Degree, of Joy on the Countenance, may be repre- 
fented by rendering the Adion of thefe Mufcles 
more or lefs ftrong; for, fuppofmg the Mind was 
happy and glad upon any Occafiom where immediate 
Laughter did not feem neceffary, a bare Difpofition 
to fmile, upon the Mouth, with the Eyes a little 
more, but not quite, open, would fufficiently denote 
it. In the Figure before us, the Mirth appears to be 
greater, and a moderate Laughter influences the 
Whole, which feems to be real, From the general 
Confent between the Mouth and Eyes $ but there is 
a great deal of Difference between this and a fidi- 
tious Mirth put on to ferve an Occafion, when the 
Mind confents not to it. 
This is very oonfpicuous in fome Players (ading 
their Parts in Comedies which require much Laugh- 
ter), who do not al ways enter well into ir, for want 
of the Mind's Influence 5 and then the Laughter put 
on appears dry and unmeaning ; and altho’ the Mouth 
puts on a Smile, it feems forced, becaufe the Mufcles 
of the Eyes are not in Confent ; for, as the Mind 
is employed in recolieding the Part he is to fpeak ? 
L its 
