Mr..Six’s Experiments to inveftigate, &c. 429 
By thefe obfervations it appears, fee Table I. that, notwithftand- 
ing fome irregularities, the heat of the days at the loweft ftation 
always exceeded that at the middle, and ftil) more the heat at the. 
upper ftation. As in many inftances the higher regions of the 
atmofphere have been found to be colder than the lower, and’ 
the thermometer in the garden was more liable to be heated by 
the reflection of the fun’s rays from the earth than the upper 
ones, a difference of this kind might have been expected. But 
Twas greatly furprifed to find the cold of the night at 
the loweft, not only equal to, but, very frequently, ex- 
ceeding the coid:at the higher ftations. As I wifhed to know,,. 
whether thefe variations would continue the fame in the win-- 
ter, when the weather was colder; and: whether a thermo-. 
meter, placed at fome diftance from the city, having an eleva-- 
tion equal to that on the top-of the Cathedral tower, would: 
apree- with it; on the rg9th of December, 1783, I difpofed 
the three thermometers in the following manner: one in my- 
garden ; one on the top of the high tower, as before; and the 
third on the top of St. Thomas’s Hill, about a mile diftant 
from the city, where, at fifteen feet from the ground, it was 
nearly level with that on the Cathedral tower.. ‘Table II. con-. 
tains the obfervations that were then made*: ‘The weather 
at this time proving cold, favoured the experiment ; and I now 
found the feveral thermometers nearly agreeing with each other 
in the day-time: but'in the night, the cold at the lower fta- 
tion exceeded the cold at the higher ones rather more than it 
did in the month. of. September, when the weather was: 
warmer. 
_* The few omiffions in this Table were occafioned by the feverity of the cold 
preventing my attending at a proper time the thermometers, which were at a 
confiderable diftance from each ather. 
At 
