on Spirituous Liquors. ^ 31 
degrees of heat, was ,82514. It was firft weighed pure, in 
the above-mentioned bottle, at every five degrees of heat, from 
30 to 100 inclufively. Then mixtures were formed of it and 
diftilled water, in every proportion from T '-th of the water to 
equal parts of water and fpirit ; the quantity of water added 
being fucceffively augmented, in the proportion of five grains to 
one hundred of the fpirit ; and thefe mixtures were alfo weighed 
in the bottle, like the pure fpirit, at every 5 degrees of heat. 
The numbers hence refulting are delivered in the following 
table ; where the firft column ftiews the degrees of heat ; the 
fecond gives the weight of the pure fpirit contained in the 
bottle at thofe different degrees ; the third gives the weight 
of a mixture in the proportions of 100 parts by weight 
of that fpirit to 5 of water, and fo on fucceffively till 
the water and the fpirit are in equal parts. The bottle 
itlelf, with its cap, having been previoufly counterpoifed, 
thefe numbers are the weights of the liquor contained in 
it, in grains and hundredths of a grain. They are the mean 
of three feveral experiments at leaft, as Mr. Gilpin always 
filled and weighed the bottle over again that number of times, 
if not oftener. The heat was taken at the even degree, as 
fhewn by the thermometer, without any allowance in the firft 
inftance, becaufe the coincidence of the mercury wfith a divi- 
fion can be perceived more accurately than any fraction can be 
eftimated ; and the errors of the thermometers, if any, it was 
fuppofed would be lefs upon the grand divifions of 5 degrees, 
than in any others. It mull be obferved, that Mr. Gilpin 
ufed the fame mixture throughout all _ the different tempera- 
tures, heating it up from 30° to ioo°; hence fome fmall error 
X x 2 in 
