[ 44i ] 
the glafs that eledrifies it, is pufliing forward to 
enter the fecond column of quickfilver. 
At the time I related this experiment with the 
bent tube in the letter to Dr. Heberden , I omitted 
certain phenomena, which attended the experi- 
ment, greatly favouring the dodrine here advanced. 
If when glafs is eledrified, and applyed to the firft 
column, we buffer the eledric fluid to pafs along 
the tube in fmall quantities only, and at fhort in- 
tervals, little luminous dreams will be feen to 
move from the firft to the 2d column of quick- 
filver, and confequently from the glafs. The like 
appearances happen, but in a contrary diredion, 
when refin or amber is made ufe of, and applyed to 
the fame column. Glafs therefore eledrifies plus ; 
or fills bodies with more of this fluid than belongs to 
them naturally: and refin, &c. vice verfa. 
When you fay, your reafoning appears to have as 
much probability as mine, I believe you do not in- 
clude your obfervation, that the eledric fluid enters 
with great freedom, and without any confiderable re- 
finance , into metals and other non-eledric bodies. Be- 
caufe the words any conjider able refinance, imply jotne 
rejijlance, which is all that is contended for: and 
a very fmall rejijlance willoccafion very extraordinary 
appearances, as I fhall be able to fhew by and by. 
There is no occafion to trouble you. with any further 
arguments to prove this rejijlance • of which your- 
felf feem to entertain no doubt ; and the accumulation 
caufed by the rejijlance is evident. 
In 
