438 Dr, Wall on the Phanomena 



repulfion depends upon a perfedly different 

 caufe. To purfue this dodrine through all thofe 

 inftances of chemical fubjedls, which fhew no 

 difpofuion to unite, would be aimoft endlefs ; 

 but that I may give it a little illuftration, per- 

 mit me to draw your attention to one example. 



One of the mod common examples adduced 

 of this repulfion, is, the immifcibility of oil 

 with water, which cannot be efFefted without 

 fome intermedium. But what is here called 

 repulfion, is perhaps, only a cafe of that kind 

 ■which is called eledive attraction (iflmaybe 

 allowed to adopt that expreflion) ; that is, that 

 the particles of water attrafl thofe of water, 

 and the particles of oil thofe of oil, more ftrongly 

 than oil attrads water ; and, therefore, when 

 thefc are mixed or brought into contact, no new 

 or more powerful attraction taking place, both 

 ingredients continue diftindl and difunited : 

 and it is upon the fame account, that when one 

 of thefe fluids is inveloped in the other, it is 

 difpofed to form itfelf into one or more fpherules 

 from the ftrong attradion of its particles i«/£r Je, 



The principle thus laid down will receive 

 illuftration from, and at the fame time will 

 affift to explain, fome phenomena refulting from 

 the immifcibility of oil and water, which, though 

 well known, have not been mufh regarded in 

 a philofophical point of view. The fafls, to 

 Vihich I particularly ^Uydp, are, the eifed of 



pil 



