24<5 ON A NATURAL SYSTEM 



they nui ft be, in reflect to our knowledge of 

 them, coniideicd r.s primitive fubilaiices : 1'uri.'. 

 is wholly inconlhli-nt v.ith the cauti-n ;iul dif- 

 tide-net; of natural philosophy to ad\ -.mce any 

 pofition npcn a bare pollibility. Daily experi- 

 ence fulliciontly trachcs, that thole thiricr, 

 v. hit!) ;:t (.nc time appc.ir highly jjrt-bablc, 111:17 

 at another be tillcuvcrcd to be entirely unfounded. 



LX.\VI. ]\t'i'J-J/lJ *./' V /'>(' Yt'l'l'il Vt.llJtT'f.l 



^fr-/'f t'j be f'ij\ t t't'il t<; ii dijLr.cl (Jt ;/:;/. 



Tin: ponderous curlli, on a* count of it -, j r rcat 

 fpeciile ;.^ra\iiy, ii defcrvingot' partieuiar uiren- 

 (ion, and h-;u! , u^ narurally to ap]>ahend it to 

 be ci incr::l;:c on;',in. Other ;:i !',unK-?its allo 

 f'.!T>port tlii, h\ iM^rl.ili-,. It i, admitted, with 

 tb'j f-.-rce ('[ an axiom, tluit p!i!'.)i;:iH(.uied alka- 

 li precipitates ir:cta!!ic fo!i.ti'.)n> only : Hut Jt 

 this alkali is dropped into a {uluti -n <: acctatcd 

 j;';ndercus eaith, it i> immc\liatc! v ihilurbed, 

 and a \\hite n^wdcr is prct'ipita r '.*d ; T\ iith, on 

 f'\;tminat.i':n. i r : f'.:V!::d to mniiil ( .f tlr.it earth 

 viJiiohiT'jd, fi"!!! t!ie vitriolic Jici.l ir.I'.erei'.r in 

 l!:r rriiflltin biue. If the pf.v.der i'. !lr:ir:;tid by 

 ir.car'.s cf a nbro, ;./.v! u ir.:\v pf.-iti.-:! ofacetntcd 

 ^-ind-.-nni-J <^r;fi added to t!:c liquid, (-TI c\pi*!i:u; 

 r to i!i'- f.v } t!:;; i'.lution, t!'or;-]j c kar bef )i'f f 

 d'-pofjts ar.fytlier ^ hite .-v. der, roiira:?::!:;.'; th" 

 pni-.d,, r.-iir, earth "nitcd with the p!',!o;;iiVie ,:!k:- - 

 Ji. '.!'}:c rri'iJ 1 ;s the f.Di:^ if thi- iv'iulcroj, 



; . t 



