SECT. III. 7. MOTIONS OF THE RETINA. 31 



by obferving that our ideas of the (hape, place, and 

 folidity of our limbs, are acquired by our organs 

 of touch and of fight, which are fituated in our 

 fingers and eyes, and not by any fenfations in 

 the limb itfelf. 



In this cafe the pain or fenfation, which formerly 

 has arifen in the foot or toes, and been propagated 

 along the nerves to the central part of the fenfo- 

 rium, was at the fame time accompanied with a 

 vifible idea of the fhape and place, and with a tan- 

 gible idea of the folidity of the affected limb : now 

 when thefe nerves are afterwards affected by any 

 injury done to the remaining flump with a fimilar 

 degree or kind of pain, the ideas of the fhape, 

 place, or folidity of the loft limb, return by affo- 

 ciation ; as thefe ideas belong to the organs of fight 

 and touch, on which they were firfl excited. 



4. If you wonder what organs of fenfe can be 

 excited into motion, when you call up the ideas of 

 wifdom or benevolence, which Mr. Locke has 

 termed abftracled ideas ; I alk you by what organs 

 of fenfe you firft became acquainted with thefe 

 ideas ? And the anfwer will be reciprocal ; for it is 

 certain that all our ideas were originally acquired 

 by our organs of fenfe ; for whatever excites our 

 perception muft be external to the organ that per- 

 ceives it, and we have no other inlets to knowledge 

 but by our perceptions : as will be further explain- 

 ed in Section XIV. and XV. on the Productions and 

 Clafles of Ideas. 



VII. If our recollection or imagination be not a 

 repetition of animal movements, I afk, in my turn, 

 What is it ? You tell me it confifts of images or 

 pictures of things. Where is this extenfive canvas 

 hung up ? or where are the numerous receptacles 

 in which thofe are depofited ? or to what elfe in the 

 animal fyftem have they any fimilitude ? 



That 



