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many valuable Purpofes of Life. The fame Con- 
clufion muft be drawn concerning Hats, which, tho' 
made of the Hair of Animals, furnifh Electricity, 
though but in a fmali Degree : And this is occafion'd 
by the mucilaginous and gummy Subftances made 
uie of by the Hatmakers, to give their Manufacture 
a fuitable StifFnefs. 
§ XXVI. From what I have advanced § XI. XII. 
XIII. XIV. XV. XVII. it may polllbly be conjectur’d, 
that the electrical Effluvia occupy only the Surfaces 
of Bodies eledtrifed 5 as we there found, that a very 
fmali Quantity of Matter, diftributed under a very 
large Surface, would occafion a greater Accumula- 
tion of Electricity, than a very much more confi- 
derable Quantity of Matter under a lefs. But that 
the ElcCtricity occupies the whole Malles of Bodies 
electrifed, and pa Acs through their conftituent Parts, 
is clearly demonftrated by the following Experi- 
ments. 
§ XXVII. When I frit engaged in thefe Inqui- 
ries, to allure myfelf of this Fact, I enveloped an 
iron Rod about three Feet in Length with a Mix- 
ture of Wax and Rclin, leaving free from this Mix- 
ture only one Inch ar each End. This Iron was 
warmed, when thus fitted, that the whole of its 
Surface, where it was intended, might be covered. 
This Rod, when eleCtrifed ar one of its Ends, flap- 
ped as ftrongly at the other, as though it was with- 
out the Wax and Helm. This could not have hap- 
pened from the Electricity’s palling along the Sur- 
face of the iron Rod, bccanfe there it was prevented 
by 
