Obfervations in Electricity. 
Hemp; flax; ftalk of the tobacco-leaf; ' 
Wool. 
Silk,. 
fpike, from the leaf of the American aloe ; 
► Neg. 
Pof. 
palma-cbrijli nut ; horfe-radifh ; . 
A white kidney-bean, fmooth furface ; ' 
black negro of the fame ; fcarlet of the 
fame ; J 
| Pof. 
Pof, 
CORALLINES. , 
| 
Sea-fan, the horny part, w ; rough 
coral, w ; - 
l Neg. 
Pof. 
Spunge, w ; coral polifhed, w ; 
Pof. 
Pof. 
S A L T s. 
Allum, w, 
Neg. Neg. 
Borax, 1 
, T . ' . r . ? fmooth furf aces ; 
Nitre purified, J 
| Pof. 
Pof. 
FOSSIL AND MINERAL SUBSTANCES. 
Common pebble-hones of all colours, , 
s; marble, s; pit-coal, s; black-lead, j 
r 
w; jet, s; aJbeJlos\ mineralized ful- > 
phur; thunder-bolt hone ; cornu-ammo- 1 
; Neg. Neg. 
nis; fhark’s-tooth; coat of petrifadtion ; J 
Several fmooth native cryftals ; brown ' 
Iceland ditto; talc , s; Ceylon pebble, / 
fmooth and tranfparent; agate, s; corne- 
> Pof. 
Pof. 
lian; amethyft, s; 
A lpecimen 
