1034 Dr - ingenhousz’s "Experiments 
6. All non-conduCting bodies may acquire on each 
part of their fubftance more or lefs of the eleCtric fluid, 
as well as conducting bodies, at leaft to a certain propor- 
tion ; but they do not allow it to pafs freely through their 
fubftance or over their furfaces, 
7. All bodies whatfoever are fufceptible of electricity, 
pofitive and negative indifferently, either by exciting 
them by friction or any other way, or by bringing them 
within the fphere of aCtion of a body already electrical ; fo 
that even metals, the beft conductors, may be as eafily 
excited by friction, if infulated, as glafs or fealing wax. 
The only material difference between the conducting 
and non-conduCting fubftances feems to be, that the elec- 
tricity does not fpread itfelf fo eafily and fo rapidly 
through or upon thofe bodies which are non-conduCtors 
as upon thofe which are conductors. An eleCtrical fpark 
thrown upon the furface of apiece of metal infulated, of 
whatever length it be, diffufes itfelf equally through the 
whole mafs, if this metal be left to itfelf out of the fphere 
of aCtion of another body charged with electricity. The 
whole electricity communicated by this fpark is dif- 
charged at once by touching any part of the fame metal. 
On the contrary, electricity feems rather to flick to that 
part of a non-conduCting body to which it is applied, 
fpreading but flowly and unequally over its furface, from 
4 which 
