32 OF REPRODUCTION 



different ways, as by painting, by fculpture, and 

 by moulds. But, though our Tenfes be limited 

 to external qualities, we know that bodies pol- 

 fefs internal qualities, fome of which are gene- 

 ral, as gravity. This quality or power ads not in 

 proportion to the furfaces, but to the maffes, or 

 the quantities of matter. Thus there are in Na- 

 ture powers, and even of the mod active kind, 

 which penetrate the internal parts of matter. We 

 are unable to form diftindt ideas of fuch quali- 

 ties; becaufe, not being external, they fall not 

 under'the cognilance of our fenfes. But we can 

 compare their effeds, and may draw analogies 

 from them, in order to account for the effeds 

 of fimilar qualities. 



If our eyes, inflead of reprefenting to us the 

 furfaces of bodies only, were fo conftrudqd as 

 to perceive their internal parts alone, we fliould^ 

 then have clear ideas of the latter, without 

 knowing any thing of the former. Upon this 

 fuppofition, moulds for the internal conftitution, 

 which I have fuppofed to be employed by Na- 

 ture, would be equally obvious and eafy to con- 

 ceive as moulds for the external figures of bo- 

 dies; and we fhould then be in a condition to 

 imitate the internal parts of bodies, as we now 

 imitate the external. Thefe internal moulds, 

 though beyond our reach, may be in the pofTef- 

 > fion of Nature, as fhe endows bodies with 

 gravity, which penetrates every particle of mat- 

 ter. The fuppofition of internal moulds being 



thu8 



