on some of the leading doctrines of caloric , &c. 367 
sents his geometrical progression of that vapour, co-ordinate 
with his equal intervals of real temperature contained in the 
second. In the third , are the corresponding points of the 
common scale, as given by Mr. Dalton. To these points the 
elastic forces, as determined by experiment, are placed oppo- 
site in the fourth column. 
Table second, for vapour of ether, is similarly arranged ; 
the first three columns being Mr. Dalton’s ; the fourth , the 
faithful transcript of observation. 
“ The force of the vapour of sulphuric ether,” says Mr. 
Dalton, “ in contact with liquid ether, is a geometrical pro- 
“ gression, having a less ratio than that of water.” “ Ether, 
“ as manufactured in the large way, appears to be a very 
“ homogeneous liquid. I have purchased it in London, Edin- 
“ burgh, Glasgow, and Manchester, at different times, of 
“ precisely the same quality in respect to its vapour.”* This 
shows that no exception can be made to my experiments on 
account of a supposed difference in the quality of the ether. 
From the mode of conducting my experiments, there remained 
always a quantity of liquid ether in contact with the vapour, 
a circumstance essential to accuracy in this research. The 
results were verified by frequent repetitions, and discover, in 
my opinion, the consistency of truth. 
New System, vol. i. pp, 20, 21. 
