PREFACE. 
I. 
/JS the following Sheets were compofed 
rather by InjunSlion and c Duty than 
Choice , it is hoped their ImperfeSlions may 
claim fome Indulgence from the Reader ; fince 
fuch Freedom can fear ce be exhibited in the Pro - 
fecution of a SubjeSl fo difficult and confined as 
might be expelled , if it were more agreeable to 
the Author , or lefs limited and particular in 
its Nature. 
However , I flatter myfelf that fomething 
New will be found in what l offer as my own ; 
which) perhaps , is capable of being further 
improved hereafter , towards the Explanation of 
the Manner in which Mufcular Motion is 
performed. 
A 2 
II. 
