590 Dr. fothergill’s Obfervations , 8cc. 
Being defirous to fee the effect of a high degree of arti- 
ficial, added to the natural cold that now prevailed, the 
thermometer was immerfed into the frigorific mix- 
ture; but though it funk the quickfilver, in a few fe- 
conds, into the bulb of the thermometer, yet the refult 
was by no means adequate to that of the experiment of 
Profeffor braun at Peterfburg : for although the quick- 
filver in the thermometer, and that in the phial, con- 
tracted a film on the top, yet it remained quite fluid 
below. 
Jan. 3 1 ft to Feb. ift, The barometer at 29 ; the ther- 
mometer only at 16 0 , that is, 17 0 below the point of 
congelation; the atmofphere ferene and pleafant. 
Feb. 2d, Wind S.; barometer 29^; a warm, mifty 
morning, fucceeded by a pleafant, fpring-like day, 
ufhered in a very mild and agreeable thaw, the thermo- 
meter from 9 0 being got up to 40°; fo great was the 
change of temperature in fo fhort a fpace of time ! And 
it feems worthy of obfervation, that the epidemic cold, 
which had prevailed univerfally during the preceding 
mild feafon, fuddenly difappeared in the late intenfe 
froft ; but now began to re-appear, together with rheu- 
matic affecftions and other difeafes of the former period. 
I am, 8cc.. 
XLI. An 
