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the Temperature of the Air here, and in London , 
at a Bated Hour : We procured Thermometers, 
made exa&ly alike, by that accurate Workman Mr. 
Bird ; and having found, by hanging them firft to- 
gether a fufficient Time, that they perfe&ly agreed, 
we began our Obfer vat ions in April y and have con- 
tinued them ever fince. 
The Thermometers are of the fmaller Size, the 
Bulbs being but about ot an Inch Diameter, and 
are immediately affetted with any Mutations of 
the Air ; fo that I have frequently been entertained 
with obferving, in fome Circumftances of the Wea- 
ther, that the Mercury has not been ftationary, but 
has fucceflively rifen and fallen for a good While \ 
and Mr. Canton has informed me, that he has feve- 
ral times obferv’d the fame. 
I have annexed a Paper, containing an Extract 
from my Journal of the Weather, in which I have 
fet down the Extremes of the Barometer and Ther- 
mometer, obferved at i h p. m. for Six Months ; 
and Mr. Canton has been lo kind as to communi- 
cate a like Extract from his Journal 5 which is like- 
wile put into your Hands. 
It appears by a more general Comparifon which 
we have made, as well as by this particular one, 
that the Difference in the Temperature of the Air, 
as to Heat and Cold, is very little between this Place 
and Spit al- Square. Sometimes my Thermometer 
has been higher than his 5 more times upon an Equa^ 
lity, but mod times lower — And I have Reafon to 
think the Difference, many times, may have been 
owing to accidental Caufes : For Mr. Canton has 
informed me, that he has found two Thermometers, 
D d when 
