C 2 39 ] 
We then began with the tubes : As you fee by 
their dimenfions, they were, except that containing 
the fulphur, by much the fmallef I had ever feen 
ufed for thefe purpofes : but every gentleman has a 
right to perform his experiments in his own way.. 
Accordingly their power in eledrifng was but weak ; 
for though fome of them attracted and repelled the 
leaf-filver tolerably well, yet when a man was at- 
tempted to be eledrifed with them, the fnaps from, 
his hand were very fmall. Of thefe four tufks, that 
with fulphur was much the ftrongeft the next to 
k, that laid to contain opobalfamutn ; then that 
with balfam of Peru, and chalk ; but the leak of 
all, that with fpirit of wine and chalk, which with, 
the common rubbers fcarce attracted the fiver ; but 
when rubbed by fome lilk prepared with 1 infeed-oil, 
and brought by Mr. Canton, the attractive power was 
increafed, though even then it was very li . tie. Mr.Can- 
ton has for fome time ufually rubbed his tubes with 
this oiled lilk., which he has found by experience to 
produce the greateft effeCts, but he does not think it 
proportionably ufeful in rubbing globes. In their 
turns the globes and ail the tubes were rubbed with 
this oiled lilk ; but no one of the company,' after 
very many trials in different ways, could perceive 
the leaf; odour of the fubftances contained, either 
upon the outfide of the tubes, or upon the fob- 
ftances eledrifed thereby.. 
We thus fpent more than two hours without fuc~ 
cefs, in our endeavours to fee the effeCls propofed by- 
Mr. Winkler; for we were, unfortunate enough not 
to be able to verify them in one fingle inftance. 
There 
