446 Appendix to Dr. Blagden’s Report 
ment 124,5, and in the short instrument 125, below o. It 
was then brought back to the temperature of 6o°, and it stood 
in the long instrument 1,5 above o as before, but in the short 
instrument 1 above o only. I heated the mixture to ioo°, 
when it stood at 182,5 hi the long instrument, and in the 
short instrument at 183,5 above o. The mixture was after- 
wards brought to the temperature of 6o°, when it was found 
to stand at o in both instruments. 
It appears from the preceding experiments, that the con- 
traction of this mixture in cooling down from 6o° to 30°, by 
the long instrument is 124,5 -j- 1,5= 126, and the expansion 
in heating up again from 30° to 6o°, the same. The expan- 
sion in heating up from 6o° to ioo° was 182,5 — 1,5 = 181 ; but 
in cooling down again from ioo° to 6o°, the contraction was 
182,5; the mean is 181,75, and the total expansion from 30° to 
ioo° will be 307,75, differing from the experiments by weight 
2,82 divisions, in defect. The difference between the two me- 
thods of heating up from 6o° to ioo°, and cooling down again 
from ioo° to 6o°, is 1,5 division. 
The contraction of the mixture in cooling down from 6o° 
to 30°, by the short instrument is 125 -f- 1,5 = 126,5 ; but in 
heating up again to 6o°, the expansion was 125 -{- 1 = 126 ; 
the mean is 126,25. The expansion in heating up from 6o° 
to ioo° was 183,5 — 1 = 182,5, hut in cooling down again from 
ioo° to 6o°the contraction was 183,5 ; the mean is 183; and 
therefore the total expansion from 30° to ioo° will be 309,25, 
differing from the experiments by weight 1,32 division, in de- 
fect. The difference between the two methods of heating up 
from 6o° to ioo°, and cooling down again from ioo° to 6o\ is 
1 division. 
