The physico-chemical processes of transport and reaction, acting in metasomatism, are described in relation to the available size of opening, from supercapillary to intra-lattice. For complete, fine-grained replacement, a large proportion of the replacement must be accomplished in the openings of smallest size, by the processes operative in that type of openings. On the other hand, movement of matter for relatively long distances, must be accomplished in larger openings. Each of the described mechanisms may take part in some phase of the overall process of metasomatism. Some recently postulated processes are found to be unsatisfactory as stated.

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