22 
case of mixtures, when a plug of cotfcon wool w^as inserted 
in the neck of the bottle. The mixtures were made by 
running in from a burette a certain number of drops of the 
different liquids. 
Boiling point. Heiglit in millimetres. 
Benzene 
80- 
soj < 
f 83-65 
i 83-05 
Teluene 
..109-7- 
110-05 <1 
f 83-95 
1 83-2 
Orthoxylene . . . 
143- 
8 
ffi6-95 
Para „ 
..137-6- 
138-8 
.83-80 
Meta „ 
..138-2- 
138-7... 
.84-3 
Pseudo cumene.. 
....167- 
169 
.86-1 
Mesitylene 
160- 
161 
.84-75 
Temp. 
15° 
16° 
15° 
16° 
15J° 
15J° 
16° 
16° 
16° 
Alcohol (absolute) 
200 drops benzene 
2 „ alcohol 
Carbon bisulphide 
200 drops benzene 
5 „ CSa 
200 drops benzene 
10 „ CSa 
Petroleum 79-81 
300 drops benzene . . 
10 „ petroleum 
300 drops benzene .. 
6 ,, petroleum 
! 
} 
71*5 
82-5 
64-9 
82-7 
81- 45 
71-8 
82- 45 
83- 1 
16° 
15° 
15° 
15° 
15° 
15° 
15° 
It appears from the above that in the case of the pure 
hydrocarbons, the difference is too small to be able to base 
upon it any reliable method of analysis. In case, however, 
of small quantities of impurities, which are often found in 
commercial benzene, the height of the column is sufficiently 
depressed to be able to detect the presence of small quantities 
of carbon bisulphide or petroleum. 
