[ 6 7 2 ] 
degree of artificial cold fixed by Fahrenheit j for 40 
degrees below zero, in Fahrenheit’s thermometer, is 
equal to 210 degrees of that of De Lifle. 
Mr. Braun repeated this experiment again, exactly 
with the fame luccefs with that of the day before. 
The counfellor and profefi'or Lomonofibw made the 
fame experiment on the fame day ; and by means ot 
aqua fortis the cold came to 495 degrees. He then 
poured in fpirit of common or fea fait, and the 
quickfilver fell down in the thermometer to 55*4 de- 
grees , and in taking the thermometer from the mix- 
ture, the quickfilver continued to fall in the open 
air to the ypd degree. He threw yet into the glafs 
a little more fnow, pouring on it fome oil of vitriol, 
and fuddenly the quickfilver fell to 1260 degrees. 
Then he broke the ball, and found the mercury 
changed to a folid body. The quickfilver, which 
yet remained in the tube, was alfo become folid, and 
appeared like a loofe filver wire, attached to the ball, 
which was flexible every way. He gave the ball of 
quickfilver feveral blows with a turned ax, and it 
became flat like a half-ruble, or Englifli half-crown ; 
but receiving thereby fome cracks, it diflblved in 
about 20 minutes. Thefe experiments were made 
when the air was at about 208 degrees of cold. 
Mr. Krafe, Mr. Zeicher, and the firfl: apothecary 
Model, and again Mr. ^Epinus, repeated the fame 
experiment with the very fame fuccefs. It is to be 
obferved, that at the fecond experiment by profeflor 
Zeicher, on the 3 1 ft of December, as the air was 
then only at the 183d degree of cold, in taking 
the thermometer from the mixture, in which the 
quickfilver was at 300 degrees, it fell yet 100 de- 
grees 
