[ 3*3 3 
It appears therefore, that the will hath a dired 
power of heightening, increaling, and rendering more 
acute, the fenfe or feeling of a given nerve, difperfed 
throughout the whole contrading fubilance of a 
given mufcle, with all its gradations of accuracy and 
perfection, by repeated ufe and exercife. 
Solution , or anfwer to the problem. 
It follows therefore, that, a mufcle being given. 
In its natural date, in a living animal body, the 
blood, which is prefent in every part of its contrad- 
ing fubftance, and which, in effed, to the fenfe of 
the given mufcle, (which is occafionally render’d 
more acute) puts on an increafed heat, and again 
lays it down at the command of the will, is the im- 
mediate mechanical caufe, by which the mufcle 
does inftantly contrad, and is again relaxed, at the 
command of the will. 
Therefore, a full folution is given to the queftioa 
propofed : which was to be done. 
Corollary i. 
Hence it appears, that mufcular voluntary motion 
is performed merely as a fenfation ( a ), extremely 
acute, and under the niceft management of the will : 
which explains its velocity in a great meafure. 
R r Corol. 
fa) Hartley Conjeftura de fenju^ fete. 
