[ 397 ] 
the fmoak is inflantly, and with a kind of violence, 
attracted to it ; till it becomes compleatly covered 
with it. It remains in this fituation for fome fe- 
conds, when it begins to difappear, at the bottom; 
and proceeds gradually, till it comes to the top ; 
where it hangs quivering, like the departing flame 
of a lamp. It goes off in a long thin column, 
which rarefies, and difperfes at the top, till it oc- 
cupies a great fpace. Obferve that, in giving the 
fpark, and bringing the taper towards theinfulated 
body, particular care mull be taken, that the air 
be diflurbed as little as poflible. 
The green wax taper , on account of the 
verdegreafe it contains, anfwers excellently, in 
this, and feveral other experiments, where fmoak is 
required without heat : and I firfi: ufed it, from a 
hint Dr. franklin was fo obliging as to give me. 
SECTION SECOND. 
Of the DIRECTION of die ele&ric matter, in the difcharge of 
the LEYDEN BOTTLE. 
EXPERIMENT I. 
L IGHT a fmall wax taper, and place it, with the 
flame exactly between two brafs balls A and B, 
about two inches afunder; properly introduced into 
the circuit [tab. xiii. fig. 8.]. Then, having gi- 
ven a fmall phial two or three turns of the globe, 
charging it pofitively, conned! the coating of it * 
by a chain, with the wire of the ball A ; and upon 
applying the knob of the phial, to the wire of the 
ball B, you will obferve the flame to be plainly 
■ . driven 
