Of Mercurial Powders . 
wards the middle or center of the faell, where there 
was a very fmall round white fpot. In this minute (hell 
we have a very good inftance of the curiofity of nature, 
in another kind of animals, removed by their fmallnefs 
beyond the reach of the naked eye; and as there are 
feveral forts of infedls and vegetables, fo fmall as to have 
had no names ; fo likewife by this, we find there are 
alfo exceeding fmall, or rather minute fhell-fifh. Nature, 
by the afliftance of the microfcope, having (hewn to us 
her curioilties, in every tribe of animals, vegetables, 
and minerals. 
Of fmall diamonds or {parks in dint. 
Flint (tone being broke in pieces, the infide cavity 
1 ~\- of it appeared to be crufted all over with a pretty- 
candid fubfkmce, reflecting the light from fome of its 
parts very vividly ; but on examining it with the raicro- 
fcope, the whole furface of that cavity could be perceived 
to be befet with a multitude of little cryfralline or ada¬ 
mantine bodies, curioufly fhaped, as at B, fig. 563. and 
afforded a very agreeable object. 
An atom, or globule of quickfilver, when placed be¬ 
fore the microfcope, feems like a -convex mirrour, in 
which may be feen all the circumambient bodies j as the 
windows, trees, and furniture, See. 
Of mercurial powders. Sec, 
I N thofe chymical preparations of mercury, which is 
called turbith mineral, mercurius vitae, dulcis, fubli- 
mate, precipitate, and mercury cofmetical, calomel, and 
all other mercurial powders, are found, when examined 
by 
