„- 0 Dr. Blagden’s Report , 
often as was neceffary for communicating the required heat to 
the liquor ; but care was taken to wipe the bottle dry after 
each immerfion, before it was lhaken, left any adhering 
moifture might by accident get into it. The liquor having by 
thefe means been brought to the defired temperature, the next 
operation was to fill up the bottle exactly to tae mark upon the 
neck, which was done with feme of the fame liquor, by means 
of a glafs funnel with a very fmall bore. Mr. Gilpin endea- 
voured to get that portion of the liquor which was employed 
for this purpofe, pretty nearly to the temperature of the liquor 
contained in the bottle; but as the whole quantity to be added 
never exceeded ten grains, a difference of ten degrees in the 
heat of that fmall quantity, which is more than it ever 
amounted to, would have occafioned an error of only of a 
degree in the temperature of the mafs. Enough of the liquor 
was put in, to fill the neck rather above the mark, and the 
fuperfluous quantity was then abforbed to great nicety, by 
bringing into contact with it the fine point of a fmall roll of 
blotting paper. As the furface of the liquor in the neck would 
be always concave, the bottom or centre of this concavity was 
the part made to coincide with the mark round the glafs : and 
in viewing it care was taken, that the near and oppofite fides of 
the mark Ihould appear exadlly in the fame line, by which 
means all parallax was avoided. A filver cap, which fitted 
tight, was then put upon the neck, to prevent evaporation ; 
and the whole apparatus was in that ftate laid in the fcale t)f 
the balance, to be weighed with all the exa&nefs poffible. 
The fpirit employed by Mr. Gilpin was furnilhed to him 
by Dr. Dollfuss, under whofe infpe&ion it had been re&fied 
from rum fupplied by Government. Its fpecific gravity, at 60 
* degrees 
