82 
PROFESSOR W. RAMSAY AND DR. S. YOUNG 
r qjj 
§24. Chloral methyl-alcoliolate, CCl 3 CH«j qqjj •—This substance is formed by 
direct combination of chloral and methyl alcohol, with evolution of a large amount of 
heat. It has been little investigated. Its boiling-point is given by Martins and 
Mendelssohn-Bartiioldy at 98° (‘ Berichte,’ III., p. 443), and by Jacobsen at 106° 
(‘ Annalen,’ 157, p. 243). The melting-point is stated by Jacobsen to be 50°. We find 
it, however, to be 40’2°. These numbers are discordant, but it is to be noticed that 
the numbers given by Jacobsen are with methyl and ethyl compounds of chloral 
invariably 8° to 1 0° higher than those given by other observers. 
The methyl alcohol used by us in preparing this body was made from pure crystals 
of methyl oxalate, and was carefully dried. It was mixed with chloral, and the 
resulting compound was crystallized over sulphuric acid. The crystallization of both 
ethyl and methyl compounds, from their solution in the respective alcohols, is 
extremely beautiful. The crystals grow upwards out of the liquid, and assume the 
form of luxuriant vegetation. 
§25. Pressures of Dissociation of Chloral methyl-alcoholate in Barometer-tube. 
Temperature. 
Pressure. 
Time required to 
establish equilibrium. 
Remarks. 
17-0 
millims. 
8-8 
1 h. 
Solid. 
35-0 
17-0 
16' 
99 
40-0 
18 1 
Constant at once. 
45-0 
21-3 
15' 
Liquid. 
40-0 
14-9 
35' 
Liquid, cooled below M.P. 
35-0 
10-3 
50' 
99 )) 99 99 
Liquid. 
50-0 
30-7 
8' 
55-0 
40-0 
5' 
60-0 
56-6 
2' 
65-0 
73-2 
4' 
70-0 
98-5 
5' 
78-05 
154-2 
3' 
9 9 
The level of the mercury in the trough was then raised, and the tube allowed to 
cool; complete condensation occurred, and after 16 h. the mercury was in complete 
contact with the solid at the top of the tube. The level was then lowered. 
Temperature. 
Pressure. 
Time required to 
establish equilibrium. 
Kemarks. 
O 
18-0 
millims. 
9-3 
48' 
Solid. 
85‘0 
218-9 
12' 
Liquid. 
90-0 
281-4 
19' 
95-0 
358"4 
7 
99 
100-0 
452-8 
6' 
105-0 
566 - 2 
26' 
99 
It will be noticed that the liquid has apparently a lower vapour-pressure than the 
solid. At 35° the vapour-pressure of the solid is 17 millims., and of the liquid only 
