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Escher (3), of R. W. van Bemmelen (1) and that of the author (4). In this
connection, on the basis of Esclier's classification, the terms of "constructiv
e " and "destructive" eruptions are introduced into the author's system and
at the same time Escher's concept on the possible relation between the depth
of magma-chamber and the measure of the gas-pressure is discussed briefly.
Three complementary remarks to the first paper (4) 011 the subject of system
of volcanic activity are added.
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