462 Memoir on Sulphuric Ether. 
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For the last two days there was only a drop 
of fluid left at the bottom of the tube (nearly 
5 inches deep) which seemed to be not eva- 
porable; but it was judged proper to conti- 
nue the experiment in order to ascertain whe- 
ther the vessel was perfectly air-tight, and of 
course the gage would continue stationary. 
The drop of fluid smelled of alcohol, and 
when diluted and treated with muriate of 
barytes was milky. 
By making the calculation ‘as above, the 
specific gravity of ether vapour from the 
first part of the experiment comes out 3.05, 
and from the last part 3.2.—The slow man- 
ner in which ether evaporates in these cir- 
cumstances is surprising ;—In the latter part 
