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The adsorption of water vapor on the surface of glass has been extensively studied. As early as 1830, Faraday (11) pointed out the large adsorptive capac-

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In previous papers of this series evidence was advanced that: (i) The expansion which unactivated wood charcoal undergoes when adsorbing gases or vapours is directly proportional to its surface (free) energy lowering (Parts II and III). (ii) The Gibbs adsorption equation, relating the adsorption, the surface energy decrement of the charcoal, and the pressure of the gas, is valid except when a change of surface phase is in progress (Parts II and III).