27* ON A NATURAL SYSTEM. 



indeed, will be obferved in whatever formula is 

 employed. Therefore it is neccflury, together 

 with the number of the principles, to coniider 

 the weight of each. 



} cxxxviii. /// ivlat Manner can this DC- 

 feel be J applied or corrected. 



THAT they may be all fymbolically defined, 

 and rendered obvious to the fenles, a certain lo- 

 cal value mull be ufligncd to every letter; To 

 that whatever principle occurs full in combina- 

 tion, that fhould be underilood to be the heavi- 

 cflof the whole mufs: livery intermediate prin- 

 ciple \\ill yield to the p cceding one, but ex- 

 ceed thofe that follow it, and the lull oi'all will 

 be of the leail importance. 



5 c xx xix. Enumeration of double Species. 



ACCORDING to this fyilein then \\efliall have 

 twenty double fpecies : 



pc t pm, pa, ps. 



cp, cm, at, cs. 



111 pi vie, inn, MS. 



ap, ac % ttm t as. 



fa /'. /'" > 



