whenseparated from the body. 299

Variety enough exhibited in disposing the othersenses 5 in the several species of animals, to

let

Routing a certain manner of perception, or confining thatbanner to a particular degree , that it be not more extern-s y e than suits our present condition; butare not the causesof that perception in the soul. The right disposition ofmedium, and the due distance of the object, are alsoNecessary to perception, which nevertheless are not cause*ef that perception. So the bad disposition of the humoursan d coats of the eye may hinder perception; though theirhght disposition .be not the cause of it; in the first casel be limitation is total , and in the last some part is removed,Now since each organ is the instrument only for limiting2 Certain manner ofperception, or confining that mannerto a particulat degree we are to fay, That the soul haththe capacity of perceiving in that manner, not becausesuch an organ is the instrument; but that such anorgan is made the instrument to limit that manner°f perception to a particular degree, because the soulN^h the capacity previously in its own nature withoutimitation. And indeed it is not to be supposed, ifthere were an. eye placed on the back-part of the head,tvhich might communicate motion from objects behind,that the foul would not fee these objects likewise, as itPerceives those before us. This would be (if I may fpexpress it) to fancy the foul blind on that side. What-ever reason there is that it should be percipient of moti-on coming from one part; the fame there will be for itsbeing percipient of motion coming from any other part^d really from all parts round. And I have immedi-ate!/ sliewn, that the particular modifications of the mo-tion,