254 ATnAttfe of BODIES. Chap.2}. 



fornc ochcr difpofing of parts under the fame generall (cope: for 

 it is enough for our turn, if we fhcw that fuch effc&s may be 

 performed by corporcall agents, working as other bodies do, 

 without confining our felvcs to an cxadnefle in every link of 

 the long chain that rnu.ft be wound up in the performance of 

 them. 



Zt To come then to the matter; The next thing we are to em- 



'Conccmms fc- ploy our felvcs about, now that we have explicated the natures 

 ve : aii compo- o f cno motions by means whereof bodies are made and de- 



lirtons o: mixed J 



bodies. ftroyed ; and in which they arc to be confidercd chiefly as paf- 



five, whiles fomc exteriour agent working upon them caufeth 

 . fuch alterations in them , and bringeth them to fuch paflc as we 

 fee in the changes that are daily wrought among fubftances; is 

 to take a furvcy of thofe motions which fbme bodies have, 

 wherein they feem to be not fo much patients as agents ; and do 

 contain within themfelves the principle of their own motion ; 

 and have no relation to any outward object, more then to ftirrc 

 up that principle of motion, and let it on work : which when it 

 is once in aft, hath as it were within the limits of its own king- 

 dome, and fevered from commerce with all other bodies what- 

 focver, many other fubaltern motions over which it prefideth. 



To which purpofe we may confider, that among the com- 

 pounded bodies whofe natures we have explicated; there are 

 fome in whom the parts of different complexions arc fo fmall 

 and fb well mingled together,that they make a compound which 

 to our fenfe feemeth to be all of it quite through of one homo- 

 geneous nature; and howfoever it be divided,each part retaincth 

 the entire and complete nature of the whole. Others again there 

 are, in which it is eafie to difcern that the whole is made up of 

 feverall great parts of very differing natures and tempers. 



And of thefe there are two kinds: the one,offuch as their dif- 

 fering parts leem to have no relation to one another , or corre- 

 fpondence together to perform any particular work , in which 

 all of them are necefTary; but rather they fecm to be made what 

 they are, by chance and by accident; and ifone part be fevered 

 from another, each is an entire thing by itfelf, of the fame na- 

 ture as it was in the whole; and no harmony is defrroycd by 

 iiich divifion. As may be obfervrd in fome bodies digged out 

 of mines, in which one may fee lumps of rrtctall, ore, itone, 



and 



