new Electro-chemical Phenomena, 
57 
13. Ammonia afforded no very distinct results. I attempted 
to ascertain its electrical state by disengaging it through a 
small tube placed between the conductors, the atmosphere 
being slightly tainted with muriatic acid; but it was apparently 
equally attracted and repelled by the electrical surfaces. When 
the conductors were coated with turmeric paper, the negative 
appeared sooner reddened than the positive, but in a very 
short time the effect upon each became equal. 
14. Benzoic acid evolved by gently heating benzoin between 
the electrical poles, was attracted to the positive side ; but 
when the balsam took fire, the flame and carbonaceous matter 
were immediately drawn in an opposite direction. 
I heated some pure benzoic acid placed upon a silver cap- 
sule, between the balls; as long as the temperature was only 
sufficient to raise it in vapour, it took the positive direction ; 
but the moment that the acid was inflamed, the carbonaceous 
fumes passed to the negative side. 
15. Camphor during its combustion throws off' a large 
quantity of charcoal, and when burned between the opposite 
electrical surfaces, furnishes a good instance of the attraction 
of that substance by the negative pole, which soon becomes 
coated with it, the positive ball being much less soiled. 
16. The resinous bodies in general exhibited the same ap- 
pearances as camphor: when in a state of combustion, both 
the flame and smoke were repelled by the positive, and at- 
tracted by the negative pole. 
17. Amber, on the contrary, presented phenomena nearly 
similar to those of benzoin. When brought into a state of 
fusion, its add vapour was attracted by the positive ball, but 
when made to burn, an opposite effect was produced. 
MDCCCXIV. 
