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In our previous paper2), the plate efficiency of a perforated plate column where only liquid film resistance exists was discussed to show that the behaviours of Murphree efficiency could be quantitativ ly represented in terms of the so-called length per transfer unit, Lx. In this paper, an adiabatic humidification column where only gas film resistance exists is discussed.The experimental results are compared with the results obtained by Gerster et al1), and the following conclusions are arrived at. 1) Provided the overflow rate is constant, the Murphree efficiency shows the maximum value, when the gas velocity reaches the point at which the foam height is greatest.2) The Murphree efficiency increases with the increase of liquid rate, provided the gas velocity is constant.3) In ordinary operating conditions, the hole diameter and pitch have no influence on the plate efficiency. 4) When only gas film resistance exists, Murphree efficiency can be calculated by the following equations.