it. But Bill we never afcribe motion to the Sen-fations. Even when the perfon who feels any ofthofe Senfations, and confequently the organ bywhich he feels them, changes his fituation, we ne-ver, even in this cafe, fay, that the Senfation mo-ves, or is moved. It feems to exift always, wherealone it is capable of exilling, in the organ whichfeels it. We never even afcribe to thofe Senfarionsthe attribute of reft; becaufe we never fay thatany thing is at reft, unlefs w’e fuppofe it capableof motion. We never fay that any thing doesnot change its fituation with regard to other things,unlefe we fuppofe it capable of changing thatfituation.

Fourthly, Thofe Senfations, as they have no ex-tenfion, fa they can have no divifibility. Wecannot even conceive that a degree of Heat orCold, that a Smell, a Tafte, or a Sound, lliouldbe divided (in the fame manner as the folid andextended fubftance may be divided) into twohalves, or into four quarters, or into any othernumber of parts.

But though all thefe Senfations are equally in-capable of divifion; there are three of them,Tafte, Smell , and Sound ; which feem capableof a certain compofitiori and decompofition. Afkilful cook will, by his tafte, perhaps, fome-times diftinguilli the different ingredients, whichenter into the compofition of a new fauce, andof which the fimple taftes make up the compoundone of the fauce. A fkilful perfumer may, per-haps, fometimes be abl« to do the fame thing