[ 58 ] 
XI. Part of a Letter fromMr.Txcirfo\zy,F.R.$. 
to Martin Folkes, Efq\ Prek R. S. concerning 
the Light caufed by Quickfilver Jhaken in 
a Glafs Fube^ proceeding from Electricity. 
Hague , 4 Feb. r 745. N. S. 
Read Feb. l 3-"\ ft R. I ’ Allamand continues here ver 7 
I 74S' 6 - I V f fuccefsfully his Experiments upon 
Electricity, and is at all times pleafed to communi- 
cate them, in order to excite others as much as he 
can to purfue the fame Inquiries : He has been 
pleafed to impower me to give you an Account of 
fuch as he thought might be mod: likely to give you 
Pleafure, and at the fame time defires your Accept- 
ance of his bed: Refpcfts. 
Mr. V Allamand inclofed fome Mercury in a Tube 
clofe-ftopp’d 5 and, when he afterwards rubb’d this 
Tube, it gave a great deal more Light than when the 
fame had no Mercury in it. 
When this Tube has been rubb'd, after railing 
fuccellively its Extremities, that the Mercury might 
flow from one End to the other, one fees a Light 
ferpenting all along the Tube 5 that is to fay, the 
Mercury, as it runs along, is all luminous. 
Mr. I Allamand then made the Mercury run in 
the fame manner along the Tube without rubbing it, 
and it fiill gave fome Light, but much lefs than be- 
fore. This laft Experiment perfuaded him, that the 
Fri&ion of the Mercury againd: the Glafs might 
electrify that Glafs, in the like manner as the rub- 
bing of the Hand. And he has been confirmed in 
the 
