C 35 3 
conftant, equal, flow Stream, from the Encepha- 
Ion and Medulla fpinalis , in each of the proper 
“ nervous Fibres, &c. That it is fit for nourifhing 
“ and reftoring the Particles that are conftantly carried 
“ away from the Solids by the Vis Vit<e, Circulation 
of the Liquors, and neceftary Actions of Life ; and 
“ that the conftant Flow of the Liquor of the Nerves 
<l into the Cavities of the mufcular Fibrillee occafions 
tc the natural Contradion of Mufcles, by the conftant 
“ Nifus it makes to increafe the tranfverfe Diameter, 
<f and to fhorten the longitudinal Diameter of each 
“ Fibre ;and that it is only to allow the Mind a Power 
<f of pouring a greater Quantity of this Fluid, with 
tc greater Velocity, into what mufcular Fibres it 
“ pleafes, to account for the voluntary ftrong Adion 
t£ of Mufcles.” 
XLV. 
To this Opinion we will here fubjoin Rohhfon. 
that of Dr. Bryan Robinfon * j who, after 
taking much Pains to prove, that a Hair or Fibre de» 
creafes in Breadth as it increafes in Length, and ‘vice 
verfa, concludes that, “ if a vibrating Motion be 
tc raifed in the <iyEther contained in the Fibres of 
Mufcles, the Diameters of all the Fibres will be 
“ increafed, and their Lengths leftfen’d by that Mo* 
tc tion : All therefore that is neceffary to give Ani- 
<£ mals a Power of moving their own Bodies, is to 
“ give them a Power of railing a vibrating Motion 
“ in the <^yEther contained within the Fibres of the 
“ Mufcles. 
* Differtjtion on the father of Sir Ifaac Newton. 
F 2 
