PREFACE. iii 
great Man been learned in this Part of Anatomy, he 
would have made fewer ferve his Purpofe, and not 
allow’d different Motions to different Parts of the 
Occif ito-Frontalis at the fame time ; nor have made 
the Wrinkles of the Forehead longitudinal, which 
fhould have been tranfverfe or horizontal, by the 
Adion of this Mufcle: Nor is there, in a word, any 
Neceflity to draw the Hair ftanding upright, to exagge- 
rate his Figures in any wife, which is unnatural ; for the 
Adions of the Countenance alone will be fufficient 
to exprefs the Paflions, fince its Mufcles arc the foie 
Agents. 
IV. 
For this Reafon I have avoided changing the Atti- 
tude in the Expreflion of any one of my Figures i 
chufing rather to reprefent them as much as poflible 
on the fame kind of Face, whereon no Change 
is vifiblc, but what proceeds from the particular 
Alterations of the Mufcles peculiar to each Paffion, 
V. 
And, in order to render this Treatife, tho’ very 
fiiort, the more complete, I have added a Lift of the 
Names and Works of the Authors upon this Subjed, 
and a general Index to thefe and my former Ledures 
on Mufcular Motion , for the Convenience of fuch 
as have them, which will make the Whole the more 
perted when bound up together. 
VL 
