44 3 Appendix to Dr. Blagden’s Report 
will appear greater. The difference between heating up from 
6o° to ioo°, and cooling down again from ioo° to 6o°, is 3 
divisions, still more considerable in this than in the last expe- 
riment. 
The contraction by the short instrument from 60 3 to go 0 is 
167,5 ■ — 5 = 162,5, and the expansion from go° to 6o° again 
167,5 ~ 5,5 = 162 ; the mean is 162,25. On heating up 
■from 6o° to ioo°, 226-4-5,5 = 231,5 ; but the contraction, in 
cooling down again from ioo° to 6o° was 226+8 =234; the 
mean is 232,75, and the total expansion from 30° to ioo°= 395 ; 
differing from the experiments by weight 2,55 divisions, in de- 
fect. The difference between heating up from 6o° to ioo°, 
and cooling down again from ioo° to 6o°, is 2,5 divisions. 
After the above experiments had been made, the spirit was 
let out, and, on a subsequent day, the two instruments were 
charged again with some of the same spirit, previous to the 
following experiments. 
After bringing the spirit to the temperature of 6o°, I found 
it to stand in the long instrument 6 above o, and in the short 
instrument 2 below o. I cooled the spirit down to 30°, when 
it stood in the long instrument 158,5, and in the short instru- 
ment 166, below o. I brought it again to the temperature of 
6o°, and it returned to the same point it set off from, in both 
instruments. The spirit was then heated to ioo° ; when it rose 
in the long instrument to 235, and in the short instrument to 
230, above o. I cooled it again to the temperature of 6o°, 
when it was found to stand in the long instrument 1 below o, 
and in the short instrument 5 below o. 
It appears, from the above experiments, that the contraction 
by the long instrument in cooling down from 6o° to 30° is 158,5 
