The experiments performed show a similarity in the penetration of a dissolved salt into saturated and unsaturated specimens of the same rock; and indicate a more rapid penetration of the solvent part of the solution in the case of the unsaturated specimens.In the saturated specimens, penetration is by diffusion. In the unsaturated specimens, penetration at first is by capillarity, but after the separation has taken place, the solute moves through the solvent-saturated part of the rock chiefly by diffusion.Diffusion then is an important factor in both instances, and it is indicated that this process may play a more important role in the migration of solutions through rocks than is generally believed.

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