Results Obtained

For benzene and ethyl alcohol the results given in Table 73 have been obtained.

Table 73

Method.

Observers.

Percentage of benzene by weight.

Temperature.

1.

Young and Fortey . . .

67.55 67.64 68.1

Boiling point under normal pressure.

2c.

,, . . . .

26.

Ryland ....

26.

,, ....

721

50-51°

5c.

Lehfeldt . . .

71,3

50°

6.

.. . . . .

71.3

50°

When the mixture that distils without change of composition boils at almost exactly the same temperature as one of the components., it is probable that methods 5, 6, and 36 are the only ones that can be relied upon, and it is on the first and second of these methods that the conclusion is based (p. 92) that benzene forms a mixture of constant boiling point with carbon tetrachloride, while the exact composition of the ethyl-alcohol-water mixture has been determined by method 36.