76 
THE NATURE AND 
[sect. II. 
On comparing the two series it will be observed, that the pressure up to the 
point where the liquids change wholly into vapour is greater in the tube con 
taining the least proportion of liquid; but this I expect is entirely owing to the 
mode of trial not being susceptible of much accuracy. Up to the point where the 
change to vapour takes place, the formula derived from Dr. Ure’s experiments 
applies with admirable precision; a new formula is necessary after the change. 
The formation of vapour from the mercury in the apparatus most probably affects 
the results in high temperatures. 
108. Ure’s and Dalton’s Experiments on Ether. 
Temperature 
of vapour. 
Force in inches of mercury. 
Temperature 
of vapour. 
Force 
in inches of mercury. 
Ure’s 
experiments. 
Dalton’s 
experiments. 
Formula, 
page 75. 
Ure’s 
experiments. 
Dalton’s 
experiments. 
Formula, 
page 75. 
34° 
6-20 
6-48 
140° 
56-90 
56-4 
36 
7-5 
6-8 
44 
8-10 
8-25 
54 
10-30 
10-4 
150 
67-60 
66-9 
64 
13-00 
150 
130 
74 
16-10 
16 1 
160 
80-30 
78-8 
84 
20-00 
19-83 
94 
24-70 
24-2 
170 
92-80 
92-5 
96 
30-00 
25-2 
173 
120-0 
96-9 
104 
30-00 
30-00 
Second kind 
of ether. 
105 
30-00 
3000 
110 
32-54 
3300 
180 
108-30 
108-1 
115 
35-90 
362 
120 
39-47 
39 7 
190 
124-80 
125-8 
125 
43-24 
43-4 
130 
47-14 
47-4 
200 
142-80 
146- 
132 
60-0 
491 
135 
51-90 
51-8 
210 
166-00 
168-5 
220 
240 
194- 
The ether employed by Mr. Dalton boiled in a tube at 96°, 1 and will be very 
nearly represented by increasing the calculated quantity one fifth for the tem 
perature. Thus, for 132°, we have 
49-1 + = 58-92, 
5 
and for 220°, we have 
Dr. Ure’s ether boiled at 104° or 105°, and his experiments are very regular. 5 
194 
194 + _ = 232-8, 
5 
1 Thomson’s Annals of Philosophy, voi. xv. p. 130. 
2 Diet, of Chemistry.