{ ) 
Reafon I am perfuaded thefe Thermometers may 
very well ferve to compare the Temperature of diffe- 
rent Countries ; the rather, as I found by Expe- 
rience, that thefe Thermometers may be rendered 
fit enough to mark fenfibly the Increale, or Diminu- 
tion of the Bulk of the Mercury , within one or two 
Parts out of the 100,000 contained in the whole 
Bulk. This Sort of Thermometers has alfo this 
advantage, that as they mark the proper Expanfion 
of the Mercury in each Temperature of Air, they 
may ferve to fhew every Moment the Corre&ion 
that is to be made in the Height of the Mercury in 
fimple Barometers 5 which will ferve for reducing 
them to the Height they would have in an equal 
Temperature of Air : And one might, for this End, 
chufe and agree upon the Heat of boiling Water, as 
a fixed Term, which, in all appearance, will be the 
fame all over the World. If the Royal Society 
Ihould approve this new Conftrucftion of Thermome- 
ters, and Ihould order fome of their Members to 
make the like, we might hereafter be able exactly 
to compare the Temperature of England with that 
of this Country, and other Places where the like 
Thermometers Ihould be made. In order to reap 
this Advantage from my Experiments, I fhali com- 
municate to the Royal Society all the Obfervations 
I have made here for thefe four or five Fears pafi, 
on the Barometer and Thermometer, as foon as 1 Ilia'll 
have adapted them .to the Effedt which I juft now 
faid that Pleat and Cold produce upon the Mercury 9 
I am informed, that four or five Years ago, the 
Royal foolery fent.to M. Afo\aham Vater &zWU- 
, fenberg , large ! hermomofors of Spirit -of Wi&e, 
3 made 
