454 Memoir on Sulphuric Ether. 
sities may be calculated without very material 
error. The following table will afford a mo- 
derately good approximation, which may 
have its use till a better is made. 
Table of the Specific Gravities of mixtures OF 
Ether and Alcohol. 
Ether. Alcohol, Specific Gravity. 
TOO eo De sceccnccccecccccee -720 
DOH EO Tis ocosatetecctecseet -732 
SOs Hb 5) Wis spices caw avvvasdier .744 
710, =A 30. cosccccsnsroceinse see 2406 
RATE (eR RS Paes .768 
DO SR OO eo ecccsesesreescenses +780 
40+ = BO on cccccscccecccccccee «792 
SOME WO ii epebecccseses 804 
20. + 80 saceccuees bicdasueaidee .816 
gE ae | Pe ae ey 828 
DO = 10D venccccepscscerenvere 830 
From this table it would seem that ether of 
the second quality, or that of the shops in 
general, contains about 25 per cent. of al- 
cohol ; and that of the third quality from 55 
to 60 of alcohol; and the proportion of this 
article will be still greater on the probable 
supposition that pure alcohol is as low as .82 
in-specific gravity. | . 
So far we have considered the mixtures of 
ether and alcohol in their purest states or 
nearly such; and it. has been observed that 
