: 7 HEAT, ; 
eres | fuch colds have been often known as to bring it 
‘down °, the beginning of the feale,° or bees the cold 
ne “a a mixture of fnew and falt. as Dr. Boer- 
the fallacy of this opinion has been evinced by a variety of 
obfervations in climates that may be reckonéd ordinarily 
temperate, In Peanfylvania, in lat 40°, the cold brought i 
the mercury to 5° in 17323 at Paris, in 1709 ez 1710, the 
mercury ogy to 8°; at Leyden, in dP o 5°, and at 
Utrecht London, in 1709 and 1710, the co 
funk the fpinits hae down to the mincial cold of an ‘ice 
and‘falt mixture ; and, in 
gree w.o°3 and at Peterfburgh, lat. 59° 56’, m 
the fame with that of se ae re ae was fevere enough to 
depr refs the mercury to 28 
e learn from Dr. King’ $ rae oeitiei on the Climate 
of Ruffia, that-the cold at St. Peterfburgh, during’ the 
months of December, January, and agin BE is ulually 
from 8 to 15 or 20 degrees below 0°; and that commonly 
in the courfe of the winter, it is for a week or pte days 
fome degrees lower. In this: feafon, = water iffuin 
from the eyes hangs in little icicles on the eye-lafhes, and 
icicles appear fufpended to the beards of the peafa 
of folid lumps-of ice. But in ftill more ni 
the cold is much more extreme. aupertuis ; 
at the north polar —_ in 7736-7, found the degree of cold 
- 65° » fufficient to have made the mercury 
fi 33 carig vel r. Hutchins’s inane 
tions o —— 
phere ich is, as it were, the medium 
of all the feafons, coinciding nearly with the middle vernal 
and autumnal bferved in England by fir Ifaac 
to the heat of the cave of their royal obfervatory, or 53°- 
In cold. countries the air will be foun sated Aa to 
ts while it - eee pe sh n our 
ve or below 40°. With us the air is Sot 
warm t till it arrives at about 64’, and it is very 
d feltry at 80°: and Dr. aght, that in 
its natural tate it feagoely ex ever Ge pawon: °, app 
hending t that fuch 
a8-to raife the 
hhade ta g 
=a 
preceding ke are 
a mat the fun, but» from its immediate 
; for, in the open air, sore to its direct 
adva » the heat is found much > 
ier? mych 
=e 
re- the mean heights of the ther Societe 
senble’t to ale Sas e 
me--- 
to ate 60 or 70 divBane shoe the Place point at 32° 5. 
and the afternoon heat ia the fhade above the half of that ; 
and therefore the ordinary fummer fun heat with us does 
nearly coincide with the heat of our body, and fea water 
is between two and three times hotter th lan our common 
fhaded warin air at Midfummer. 
Sir Ifaac Newton informs us, that he found the heat of 
in pte Borelli and Malpighi found She heat at Midfummer 
equal to the heat of the vifeera 
which, in this reckoning, fhould be only at (32 + 242 = 
58 : by which, -as Dr. Martine eine 2c he peat have meant 
™m > 
morning and afternoon, for the whole time, 47°.7: The | 
dinburgh feems to be 47°, and at 
‘ranf. vol. Ixy part ii. art. 44. 
e Meteorological Journals of the Royal Society 
publthed i in the Philofophical Tranfaétions,. it appears, 
ee without snd 
within the houfe,.are as below 
‘ ‘Fherm. without... Therm. without. 
AAS ib hs 52-7 
1776 = - Be . 52-9. 
tL BP cave 
niece - = 52.0 53-b 
ae ae ft on lid ond fi 
“See ¢ Pendurore and ‘'HERMO» 
Hear, i ure and Pe ceealian) the fluid matter vue. 
pervades different plants and fubftances, and ge their- 
P > 
