[ 43i ] 
be made: and, to life the words of my learned and 
ingenious friend Dr. priestley, they are not phi- 
lol'ophers who think no advantages could be gained 
by it. Electrical bells fhould alfo be fet up, to 
give notice of electricity, in the atmofphere; and 
by a pair of light pith or cork balls, hanging by 
linen threads from the apparatus, the kind, con- 
tinuance, and changes of the electricity fhould, be 
carefully noted. It would alfo be proper to put 
out occafionally, a long flick, or. the ftrongeft parts 
of a fifhing-rod, having a box, with a pair of light 
cork balls hanging from thence, at the end of it, 
which would difcover much fmaller degrees of 
electricity in the air, than is fufficient to ring bells;, 
and by thefe, the kind of it may be readily afcer— 
tained. Such a.courfe of experiments, as I have re- 
commended in this paper, would foon throw new 
light upon the fubjeCt of eleCtricity ; hitherto, I be- 
lieve, but little underflood ; though fo interefting to 
mankind, and fo highly deferving the nicefl invef- 
tigation, of the moil curious enquirers into nature. 
But thefe purfuits can be properly attended to, by 
thofe only, who are gentlemen of fortune, and lei-- 
fure : and could fuch be prevailed on to undertake 
them, I have not the lead doubt but the exquifite. 
knowledge o t this fec-ret- part of the operations of 
nature, which they would foon attain in the prac- 
tice, would prove an ample reward of their labours;, 
an honour to their country, and perhaps a benefit, 
to the whole human race. 
XLII. A 
