on Spirituous Liquors. 451 
Having brought it to the temperature of 6 o°, the spirit in 
the two tubes was found to stand at 4 above o. I cooled it 
down to 30°, when it stood in the two tubes at 160,5 below o. 
I brought it again to the temperature of 6 o°, and it was found 
to stand in the two tubes at 4 above o as before. It was then 
heated up to ioo°, and was found to stand in the two tubes at 
23 6 above o. I cooled it down again to 30°, and found it to 
stand in the two tubes at 162 below o. It was then brought 
again to the temperature of 6o°, and was found to stand in the 
two tubes at no more than 2,5 above o. 
From the preceding experiments it appears, that the con- 
traction in cooling down from 6o° to 30°, is 160,5 -{- 4 = 164,5, 
and in heating up from 30° to 60° again, the expansion was 
the same. In heating up from 6o° to ioo°, the expansion was 
236 — 4 = 232, therefore the total expansion in heating up 
from 30 s to ioo° will be 396,5 ; but in cooling down again 
from ioo° to 30°, we shall have for the total expansion 236 
-f- 162 = 398. The former quantity of 396,5 differs 1,05 in 
defect, and the latter 0,45 of a division in excess, from the ex- 
periments by weight: but it is obvious from this, as well as 
from the preceding experiment, that the method of heating up 
from 30° to ioo° can only give the true expansion, as has al- 
ready been observed: for when the spirit is cooled down from 
6o° to 30° the expansion will be made greater than it ought to 
be ; as it was found on setting off, that the spirit in the two 
tubes at 6o° of temperature stood at 4 above o ; and after 
having been cooled down to 30°, and heated up again to 6o°, 
it was found to stand the same : but after having been heated 
up to ioo°, and cooled down again to 30°, the contraction 
