of the temperature of bolting Water- 37’t 
ihare in the heat of boiling water. Column the fixth 
fhews the height the thermometer flood at in water boil- 
ing very faft in degrees and 40ths of a degree; where it 
will be feen, that the obfervation was repeated, as the 
heat is given of every feparate trial, which is, perhaps, the 
beft criterion of the confidence that is to be placed in the 
mean refult, fhewn in column the feventh exprefied in 
hundredths of a degree. 
Having collected this feries of experiments, I was 
anxious to fee how far they correfponded with Mr .- be 
l.uc’s, and upon comparifon of N° 1 . and N° 1 5 . 1 found 
that the decreafe of the boiling heat was greater than 
the rules admitted of from an alteration of the preffure 
of the atmofphere of 4^ inches. This difference led me 
into an examination of all my obfervations, to fee how 
far they were confiftent with themfelves ; how far they 
difagreed from Mr. de luc’s ; apd, laftly, what general 
conclufion might be drawn from them. 
To avoid in fome meafure, or at leaft correct, the er- 
rors of obfervation, the mean of N° 1. and N° 2. the 
mean of N° 6. and N° 7. and of N° 14. and N° 15. was 
taken inftead of either obfervation feparately ; the firft 
and third of thefe means as two extreme terms, and the 
fecond as an intermediate one: with thefe it was very 
cafy by interpolation or proportion to deduce any other 
Ccc4 inter*. 
