OF THE PARAFFINS AND THEIR MONOHALOGEN DERIVATIVES. 33 
small range of pressures was available. Hence all the experiments were made at 
pressures near 90 millims,, and instead of plotting a cur\^e from the vapour density 
determinations, the mean of the three was taken and used in the calculation of y. 
The values are shown in Table XXIII. 
Table XXIII. 
p- 
t. 
P- 
96 
12-9 
4-288 
90 
13-2 
4-2 79 
94 
15T 
4-281 
1 
Mean . 
1 
4-283 
These will not give the correction factor, hence a determination of the relative 
densities was made with the following result:— 
Table XXIV. 
V, 
P- 
f. 
p7\ 
68-4 
79-35 
15 
5428 
o5-6 
97-40 
5414 
45-2 
120-0 
5388 
35-8 
144-5 
• • 
5153 
Nearly saturated 
The curve plotted from these gave 017 for } jp . d{ 2 ')v)ldv, and using this value. 
Table XXY. gives the values obtained for y. 
Table 
XXV. 
P- 
t. 
1. 
r. 
1 d(pv) 
p d v 
7 - 
99 
12-7 
20-77 
48-37 
I 
I r 
1-131 
90 
11-6 
20-74 
48-27 
} 4-283 
^ 1-017 
1-1.32 
90 
12-6 
20-80 
48-43 
i 
i 1 
1-131 
Mean . 
1-131 
MDCCCXCIV.-A. 
E 
