460. Memoir on Sulphuric Ether. 
Manometer. Measures of Ether 
evaporated. 
Sep. 22... ..2 Py Mescasshe OBB isposensaness 0 
Be ie, oe a I 
8 —— riceee cae er Ee wee 10.— 
ee Re Me cccats COAG ceases wesw 16.5 
9 — ...... 830 ....... sése 20,8 
3 P.M oa, BR digas dsvves, 24.6 
10 —— ...8 S18 .ee..ceee ». 28.5 
Doin) Le PsA te asede SOOs p20 conaae 34.0 
12 — ...... COM cosasewuats 38.9 
26. 2PM omer cusses coves 42.— 
9 CiiteetVBOUZ ieces. ss AO 
2813. DAALM hia sive Tb cdiidnedsene 49.5 
Now, 49.5 measures of ether=37.5 grains ; 
and this quantity being by the manometer 
=++4 of the atmospheric pressure, we have 
113: 37.5 :: 772: 256 grains, the weight of 
253 cubic inches of ethereal vapour of at- 
mospheric force; but the weight of the same 
volume of common air=77 grains. Hence 
ethereal vapour=3.3 times the specific pray 
of air. 
I find amongst my notes in 1805, a similar 
experiment, from which the specific gravity 
was deduced=2.65 only. This difference oc- 
casioned me to repeat the experiment as 
follows : 
