Obfervations in EleElricity. 1 2 9 
many purpofes to ufe a rubber with a handle of glais, 
wax, See. with which the electricity of many fixed bo- 
dies, gems that are fet in metals, &c. and other articles 
that it would be improper to divide or remove, may be 
determined. Such rubbers of different forms have been 
conftruCted and fatisfaCtorily employed in a variety of 
inftances by Mr. errington and Mr. cavallo, who 
have extended their enquiries far beyond the limits at 
which I defifted; their collection of animal, vegetable, 
foflil, and artificial fubftances, added to my catalogue, 
amounting to almoft one thoufand articles. 
G O N C L U S I O N. 
AT the conclufion of the fecond part of the pre- 
ceding paper, in my remarks upon the electricity of 
chocolate, I have obferved, that many and great difeo- 
veries have been made in this age, refpeCting the aCtion, 
influence, and effeCts of electricity ; but it is a queftion 
that hath been frequently put to electricians, What is 
electricity ? For my own part, I have generally chofen 
(perhaps for want of a better anfwer) to reply by a fimilar 
queftion, viz. What is air? or, what is water ? For, as thefe 
are underitood to be fluids diftinCt from all others, and 
Vol, LXVII. S diftinguifhed 
