f tro 71 
which the air poifeffes for the moft 
part of the year in a country, and 
thus to determine the advantages 
which would arrive to our confti- 
tution, in {pending our lives in one 
country rather than in another, on 
purpofe to prefervye a good ftate of 
health, to cure particular difeafes 
which require a pure air, or to pro- 
traét our exiftence in this world in 
particular bodily difpofitions. We 
muft as yet content ourfelves with 
the amufement of the experiment. 
The continual changes which I 
obferved in the atmofphere daily; 
by trying its conftitution, convinced 
me of the too precipitate judgment 
of fome philofophers, who, though 
furnifhed with but indifferent in- 
ftruments, have begun already to 
affert the degree of goodnefs of 
certain places, by one or two obfer- 
vations 
