st 5

essential to Matter, 6cc. 69

aud really, for want of being able to resist,be reduced into non-extenfion. Xt is becausematter resists, that it can be made firmly tocohere, or is susceptible of tension , pulfion ,pressure. No motion can be without some ofthese, either when it is begun, or when it isagain stopped; nor therefore without theresistance of solid parts to solid parts.

XXIV. Moreover, supposing we were tiedto no firm sustentacle, as the earth is, by theimpulse of gravitation, but that a man wereplaced pendulous from any such great body jas progressive motion would be then withoutmeans or foundation in nature, so any mo-tion of the parts of his body among them-selves, would be equally impossible. To ex-tend the arm, or leg, supposes the trunk, orthe rest of the corporeal moles, a firm sufien*tacle to afford resistance, and make motionpossible: whence could this proceed, if mat-ter gave way to the least pressure, or ratherto no pressure at all ? So the moving of the fin-ger supposes the hand or arm ; or the mov-ing of the tongue to speak, supposes the jaws,neck and contiguous parts, a firm sustentacleto supply resistance and re-action. The sameis to be conceived of every internal action inF x the