t4 SUflectf ona upon t?>e ^pot^efi'^ 



contrary in their operations, it feems 

 a flight and not Philofophical Ac- 

 count of their Naturf, to define an 

 Acid by its Hoftilit^firfah Alcali, 

 which (they will fay) is almoft as if 

 one (hould define a Man by faying , 

 that he is an Animal that is at enmity 

 With the Serpent} or a Lyon, that he 

 is a fourfooted beaft that flies from a 

 Crowing Coik. 



. 



CHAP. IV, 



BUT although one of the chiefeft 

 Conditions that Philoibphers 

 may juftly require in Principles, is, 

 that, being to explain other things, 

 they (hould be very clear themfelves* 

 yet I do not much wonder, that the 

 Definitions given us of Acidum and 

 Alcali (hould be but unaccurate and 

 fuperfieial, fince I find not, that they 

 have themfelves any clear and deter- 

 minate Notion or fure marks,where- 

 by to know them diftinttly, without 



which 



