Secondly, the authors state, ".. .we should expect, on the basis of polylayer for mation, decreasing adsorption with decreasing porosity also in the case of imperfect contacts,..." I do not agree that this should be expected. The real contacts of 3-mm. diameter spheres would not appreciably affect the building up of a few adsorbed layers because these few layers would require only a few angstrom units of depth. The authors' results may be interpreted in terms of capillary condensation, but they do not rule out the possibility of multilayer formation.

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