84 
PROFESSOR W. RAMSAY AND DR. S. YOUNG 
is given by Lieben as 115°. Its vapour-density has been determined by Lieben, and 
found by Dumas’s method to be 53*12 at 157°, and 50*38 at 198°. Wurtz has also 
determined the vapour-density by Hofmann’s method, and found at 100°, with a 
pressure of 247*6 millims., the vapour density to be 48*07. The theoretical density of 
the mixture of chloral and alcohol is 48*3. By Dumas’s method the alcoholate would 
be submitted to fractional distillation, which would entail a residue containing excess 
of chloral; and it is more likely that the higher vapour-density obtained by Lieben is 
to be ascribed to this cause than to incomplete dissociation. 
29. Vapour-pressures of Chloral ethyl-alcoholate in Barometer-tube. 
Series I. 
Temperature. 
Pressure. 
Time. 
Remarks. 
O 
140 
millims. 
13-5 
2 days 
Solid. 
350 
24-4 
22' 
45-0 
23-1 
13' 
Trace of liquid showing. 
50-0 
24-7 
22' 
Liquid. 
55-0 
34-6 
5’ 
9 1 
60-0 
46"6 
9' 
99 
65'0 
62-7 
O 
99 
70-0 
84-0 
5' 
„ 
75-0 
111-8 
3' 
78-0 
130-0 
3' 
Cooled to 50'0 
24-7 
45' 
Recombination. 
35-0 
9-8 
23' 
Still falling; liquid, cooled 
120 
11-2 
18 hours 
below solidifying point. 
Solid. 
35-0 
24-3 
19' 
85‘0 
187-3 
31' 
Liquid. 
90-0 
242’2 
15' 
99 
95-0 
308-8 
5' 
99 
100-0 
387-8 
10' 
105-0 
487-7 
10' 
109-4 
585-4 
9' 
§30. Series II. 
Temperature. 
Pressure. 
Time. 
Remarks. 
15-0 
millims. 
91 
1 hour 
Solid. 
35-0 
22-8 
19' 
40-0 
24-7 
25' 
45-0 
25T 
15' 
50-1 
25-9 
37' 
Liquid. 
60-0 
47-1 
12' 
Cooled to 40"0 
14-7 
112' 
Still liquid. 
„ 35-0 
12-4 
50' 
Still liquid; pressure falling 
35-0 
19-9 
16' 
slowly. 
Solid. 
