- 
PHYSICAL anv LITERARY. 332 
| Mager particles which compofe»the body, 
without refolving the particles into their pri- 
mary elements. 
— Wuen fpirit of nitre or aqua fortis is 
poured upon pieces of-filver, the appearances 
plainly point out that there is an attraction 
; betwixt the particles of ‘the folvent and the 
 filver, and that there is likewife a repulfion 
of the particles already diflolved from the 
- filver, to make way for the application of new 
particles of the folvent to other. parts of the 
filver ; for there is a remarkable motion and 
agitation in the liquor, the furface ofthe fil- 
ver foon becomes rough and difcoloured, air- 
_ bubbles are formed upon: it, which foon fly 
off, and, a conftant fucceffion of thefe arife, 
break and diffufe themfelves: if a little of 
_ this! liquor.is carefully taken off from the 
 top,,.even before. half the filver is diffolved, 
and! dropt into a muria of fea falt; it will 
_ giverevident marks that;it contains a portion 
_ of filvers. When all the metal is diffolved, 
ti becomes clear and limpid, and 
all is at reft. . Thefe things evidently thew, 
that fuch metallic ‘particles as are freed from 
their cohefion by the faline parts of the men- 
Prawn, tecede with them from the filver, 
"4 and 
