447 
on Spirituous Liquors. 
It appears from all the preceding experiments with the 
mixture of equal parts of spirit and water, that the mean of all 
the quantities found on heating up from 30° to ioo°, and cool- 
ing down again from ioo° to 30°, taken together is, for the 
total expansion, 308,46 by the long instrument, and by the 
short instrument 309,29 ; the former errs 2,11, and the latter 
1,28 divisions, in defect, from the experiments by weight ; 
and that the mean of all the quantities found by the long in- 
strument, in heating up from 30° to ioo°, gives for the total 
expansion 0,33 division less than the mean of all the quan- 
tities taken together, by the same instrument, in cooling down 
from ioo° to 30°. The difference by the short instrument is 
1,83 division. 
Although the results found from the preceding experiments 
come nearer those of the experiments by weight than might 
have been expected, considering the many objections that 
instruments of this kind must naturally present, and the great 
differences which were actually found among themselves on 
repeating the experiments, especially in the expansion of pure 
spirit, where the difference has been equivalent to 1,68 grains 
in weight, upon the quantity used in our experiments with 
the weighing-bottle ; yet I think, after a careful perusal of 
the foregoing facts, I shall not be thought too precipitate 
when I say, that these instruments neither do nor can possess 
that accuracy which we have been led to expect from them. 
We have seen, in the foregoing experiments, that there has 
sometimes been apparently a loss of some part of the fluid, 
after an alteration of the temperature ; at other times there 
appeared to be no loss at all ; and sometimes there appeared 
to be even more spirit in the instrument than there was at 
3 M 2 
