474. Memoir on Sulphuric Ether. 
Table of the itr of Aqueous, Alcoholic, 
and Ethereal Vapours. i 
Temperatures. Aqueous Vapour. | Alcohol, Vapour. Ethereal Vap. 
{common seale.) | Ratio 2.6 | Ratio 2.7 Ratio 2,. 
Tneh, Ineh, _ Inch. 
- 36¢ 29 06 © 9 PR: 
64° - “15 151 : 15.— 
96° 1.95 7 ALOT (f) 30 
132° - 5.07 (a) | » 11.00°(¢) 60 
173°. - 13.18 (8) 29.7 (h) | 120 
220° 34.2 (c) | 802 (7) | 240 
272° 88.9 (d) o—SuCt ol ereeeeree 
340° (e) 231.— — | —-—-. 
Dr. Ure’s numbers for ether corresponding 
to the above, the last exclusive, are, 6. 55, 13, 
25.7, 49. 8 [49], 96.4; the ratio is of course 
less than two, and a descending one, namely, 
1,98, 1.97, 1.94 and 1.93; this last circum- 
stance characterizes a mixed liquid. | 
J have not extended the experiments on 
ake further than 212°; but as that tempe- 
rature gives a force of 207 or 209, I esti- 
mate the force to be 240 at 220°, nearly. 
(a) Southern 4.71.— Ure 4.7 
(b) 13; ap BOS 
(e) 35. 2) oa 85 5 
(d) 88 +..— —— 89.— ———- 90 — The mean of my 
two tables. 
(e) This observation is Mr. Southern’s. There is reason to suspect 
his temperatures too high for his forces in the high pressures. They 
exceed Dr. Ure’s. 
(f) Ure 4.02 
(gi —i 11.2 
(h) —- 30.00 
(i) — 78.5—Bettan, 82. - 
