g6 Mr.' HENti’s Experiments and 
chocolate, and ascertaining its direction in the experi- 
ments. 
Before I had an opportunity of making this com- 
plete invefligation, I had feparated a piece of chocolate 
from the tin pan in which it had been cooled, and acci- 
dentally left, for fome months, under an open counter 
in a fhop, expofed to dull, damp air ike. ; notwithstand- 
ing which, on its reparation from the pan, it attracted a 
thread of trial at a quarter of an inch diftance. I then 
took a quarter of a pound of chocolate, and having 
melted it in an iron ladle, poured it into a tin pan, and 
the next day (it being perfectly cooled) feparated it from 
the pan, and found it ftrongly electrified plus', but as the 
electricity was foon loft by handling (owing, I fuppofe, 
* 
to the large quantity of conducting matter contained in 
it) I melted it again, but produced no electricity; which 
I imputed to the chocolate having become very dry and 
powdery. I therefore melted it a third time, adding a 
little oil of turpentine ; but this trial alfo (perhaps from 
the evaporation of the fpirit) failed. I then melted it the 
fourth time, and added a fmall quantity of olive-oil, Suf- 
ficient as I imagined to reduce it again to its original 
confidence, and having cooled it in the tin pan as before, 
I found on removing it, that its eleClricity was completely 
reftored. The large proportion of phlogifton in oil is 
well known ; and as the addition of oil to the chocolate 
completely 
