Ionization Curve of Methane. 



427 



necting tubes, or dissolved in the methane, was removed. 

 The methane remaining showed a vapour pressure of about 

 150 mm. of mercury. As far as can be gathered from the 

 figures available, this pressure corresponds to that given by 

 methane at the temperature of liquid air, say 90° T. 















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Evidently the gas was quite pure. A determination of its 

 density gave the value *552, taking air as unity. This figure 

 is almost identical with the calculated value, which is '553. 



