[ 305 ] 
XL VI I. Obf equations and Experiments upon 
animal Bodies, digejied in a philofophical 
Analyfis , or Inquiry into the Caufe of 
voluntary mufcular Motion ; by Charles 
Morton, M. D. F. R. S. 
Read Dec. 
1751. 
5> rpHE paper proceeds in the follow 
1 ing order : 
The Problem , or queftion propofed. 
Obfervations and Experiments^ ilinftrating the 
ftructure and ufe of the parts concerned. 
Two Lemma with demonftrations concerning 
automatic or involuntary motion. 
Obfervations proving, that the fenfations, of which 
we take cognizance, are merely relative. 
ObJ'ervatione proving, that the will has a power 
over fenfation univerfally, to render it more or lefs 
acute. 
Solution , or anfwer to the queftion, neceflarily 
a riling from the preceding fadts. 
Some Jhort J'cholia. 
Problem. 
A mufcle being given in its natural hate, in a living 
animal body, it is alked how, or by what mecha- 
nical means, that mufcle contracts, and is again 
relaxed, at the command of the will ? 
Obfervations illuflrating the fruchire and ufe of the 
parts concerned. ‘ J . 
Every mufcle of an animal body is obferved to be 
an inftrument compofed of fibres or leffer mufcles, 
q which 
