= “different Pieces 5 two of which are” 
oS ae 
| 292 4 
ploring the degree of goodnefs of 
réfpirable air furpafics the exactnefs 
of judging of the degree of heat 
and cold by the thermometer she: 
Reaumur. 
The Abbé has, fince I faw him 
at Paris, changed fomewhat his in- 
firuments and “method of ufing 
them, or rather corrected them a 
little; but they remain fill mate- 
~Fially the fame as they were “Bez 
fore. : 
I*muft bee the reader to ftop 
here, end to eatt his eyes upon the — 
copper plate and the explication: of 
he figures before he aed sie : 
: ther. 3 
Vie new allot; or in fide 
“ment for findings the accurate degree 
of falubrity, or’ ftne(s fer refpita- 
‘tiom of a ‘given air, confifts - of 
