[ 55 ° ] 
It remains, Sir, that I communicate to you the 
obfervations, that Mr. Ludolf made at Berlin. I pre- 
fent you with them, as Mr. Euler was fo kind to fend 
them, which I have tranfcribed word for word. 
“ As I was not prefent (lays this learned man) at 
“ the experiments made upon thunder, I will have 
“ the honour to tranfcribe for you the recital, that 
“ Mr. Ludolf communicated to me. The experi- 
“ ments were made the 19 and 26 of July, and the 
“ 1 and 2 of Auguft j” and it is obferved, 
1 . That the fparks drawn from the wire were half 
an inch long ; and they caufed fo horrible a fhock, 
that the intire body of the perfon, who attracted 
them, was fliaken; but the fmall fparks produced 
only a light fenfation in tire fingers. 
2. It is alio remark’d, that this electricity com- 
municates itfelf to all bodies elfewhere, that are fuf- 
ceptible of it, provided they are placed upon eleCtri- 
cal bodies^ while they are made to communicate by 
a wire. 
3. When there was plenty of rain, we fcarce re- 
marked any thing of the force of the eleCtricity, al- 
tho’ the lightning and claps of thunder were very 
flrong. 
4. At every -clap of thunder the electricity feem’d 
extinCt, and returned not till after 30 feconds, or 
thereabout, and fometimes longer. 
y. When the wire was lurrounded with drops of 
rain, it was oblerv’d, that only fome of them were 
eleCtrical, which was remarkable by the conic figure 
they had ; whilft the others remain’d round as be- 
fore. It was alfo perceived, that the eleCtrical and 
non-eleCtrical drops fucceedcd almoft alternately ; 
which 
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