468 PROFESSOR W. RAMSAY AND DR. S. YOUNG ON THE INFLUENCE OF 
through the funnel, to replace that which had evaporated. The temperature was 
registered by a thermometer graduated in tenths of degrees, shown in the figure. 
16. Series I. 
Temperature. 
Pressure. 
State. 
millims. 
19-4 
11-0 
Liquid 
10-7 
5*9 
55 
10-7 
6-0 
55 
13*2 
8-0 
54 
4*5 
5T 
5'5 
4-4 
5 5 
1*7 
3-4 
5-4 
5*0 
Solid 
1*7 
3*8 
55 
9-6 
6-7 
55 
13*2 
80 
55 
13*0 
7*9 
9 5 
17. These numbers in their irregularity resemble those given by Kegnault (Mem. 
de l’lnstitut, vol. xxvi.), and gave no indication of a difference in vapour-pressure 
between the liquid and solid states. 
Thinking that the higher vapour-pressures of the solid acid might be due to the 
liberation of the small amount of dissolved air during; solidification, another method of 
filling the tube was resorted to. 
For the second series the method adopted was that previously employed for camphor; 
after a plain barometer-tube had been boiled out, liquid acetic acid was introduced, 
and after exhaustion was frozen. Mercury was then admitted, and while the acid was 
still solid, the tube was inverted over mercury ; the acid on melting rose to the top. 
Even with this precaution a minute trace of air was still present. 
18. Series II. 
Temperature. 
Pressure. 
State. 
millims. 
15-9 
9-3 
Liquid 
18U 
10-4 
59 
16-85 
9-6 
16-3 
9-3 
15-7 
9-1 
12-3 
6-3 
7 - 7 
51 
55 
1-6 
4-0 
Solid 
4-7 
5-1 
59 
11-9 
7-8 
>1 
13-4 
8-3 
5 5 
8-7 
6-3 
95 
5-55 
51 
95 
4*6 
5-0 
55 
1-5 
41 
55 
