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conftitutes another of the chymical principles called 
fulphur ; in like manner as this iulphur is con- 
ftantly found highly electrical in all bodies where it 
abounds in a folid form, viz. refins, wax, &c. 
Thefe experiments appear to verify my fuppoft- 
tion : for all the above-mentioned fubftances, which 
were thus changed into non-conduCtors, confift either 
wholly, or in a great meafure, of earth freed from 
the unCtuous inflammable particles ; the metals not 
being calcineable without a degree of heat that mufl 
difiipate all their fulphur, as is evident from their 
not being reducible again into their metallic form 
without the admixture pf fome unCtuous matter ; and 
the fame difiipation of their fulphur muff take place 
in the animal and vegetable fubftances, before they 
become white allies. 
I fhall not at prefent attempt an account, why 
bodies confifting of either of thefe fubftances fepa- 
rately are eleCtric, tho’ it appears to me deducible 
from fome doCtrines of Sir Ifaac Newton ; but 
only propofe a thought concerning the reafon why 
thefe two principles, calx and fulphur, which are 
known to unite in the compofition of almoft all 
bodies, fliould, notwithftanding they are eleCtric 
when feparate from each other, be yet found non- 
electric when united in one bodv. 
It muft be remembred, that there is a remarkable 
and well-known oppofition in the eleCtrical effeCts 
of thefe two clafies ; the earthy one (as glafs and 
ftones) electrifying plus , and the fulphureous one 
minus. Does it not feem then a thing to be expeCted, 
in a body compounded of both, that the oppofite 
powers of thefe ingredients fliould ccunterballance 
and 
