452 Appendix to Dr. Blagden's Report 
from 6o° to 30° was found greater by 1,5 than before ; and oil 
heating up to 6o° again, it was found to stand only 2,5, in- 
stead of 4, above o. It is therefore very reasonable to con- 
clude, that a quantity equal to 1,5 had adhered to the upper 
part of the tubes, and no well-grounded objection can be 
made to this, when we consider that 1 division is only equal 
to ,015 of a grain of spirit, in this instrument. 
It appears then from the preceding experiments, that the 
mean of the quantities found, on heating up from 30° to ioo°, 
including the error that must arise from some of the fluid ad- 
hering to the tube, in cooling it down from 6o° to 30°, pre- 
vious to its being heated up from 30° to ioo°, gives for the 
total expansion of the spirit 3 96,75 ; and in cooling down 
from ioo° to 30°, 398,0; the difference is 1,25: but I have al- 
ready shewn that this difference is not so great as it would 
have been had it not been cooled down from 6o° to 30°: if 
therefore we say, as 232 : 1,25: : 164 : 0,88, it is evident that 
the latter quantity must be subtracted from 3 96,75, and there 
will remain for the total expansion of the spirit by this in- 
strument, in heating up from 30° to ioo°, 395,87, which is 
different from the experiments by weight 1,68 division, in 
defect. 
The following are experiments made with the same instru- 
ment, and a mixture of equal parts of spirit and water, being 
some of the same which was used in the former experiments. 
Having charged the instrument with this mixture, it was 
immediately put into a vessel of water, whose temperature was 
6o°, and the mixture was found to stand in the two tubes at 3,5 
above o, I then cooled it down to 30°, and it sunk to 122 
