744 Co/. hoy’s Experiments for 
Thus air at Spitzbergen feems to be fpecifically hea- 
vier, than that affected with the fame heat and preffure 
in the middle latitudes: whence it follows that, inftead 
of 3 a 0 which is found to be the zero of the fcale about 
the middle of the temperate zone, we fhall have — 
1 9 0 . 2+42,°= 6i°.2 for the zero at Spitzbergen, within 
10° of the North Pole. 
It is much to be regretted, that the French academi- 
cians, when employed in meafuring the degrees of the 
meridian in Peru, were not fupplied with better barome- 
ters, and that they made not obfervations at correfpond- 
ing times ; fince the fcene of their operations was un- 
doubtedly preferable to any other on the furface of the 
globe, for determining many curious points with refpedt 
to the modifications of the atmofphere in the torrid 
zone : neverthelefs, by attending diligently to what Mr. 
bouguer ,n> hath told us, of the fteadinefs of the baro- 
meter 
( n ) He fays, that at the South Sea, Reaumur’s thermometer, in the morn- 
ing before Sun-rifing, flood at 19°, 20°, or 21°; and in the afternoon at 26°, 
27 , or 28 . T. he refpeftive means correfpond to 76°^ and 92T of Fahren- 
heit, and make the mean heat of the day 84T At Quito the temperature 
continued at i4°or 1 5 0 , anftvering to 65°- of Fahrenheit. At the fummits 
of Corajon and Pichincha, the thermometer flood in the morning feveral 
degrees below freezing, and varied 17 0 in the heat of the afternoon; whence 
the mean temperature at thefe higheft Rations, would probably be about 43° j of 
Fahrenheit. He farther fays, that in the torrid zone, whatever may be the 
mean 
