Abstract
THE question of the extent to which rocks have been made and modified by assimilation of extraneous material and ores have been formed by consolidation from molten rock, has been long discussed, and the possibilities shown by many experiments. Prof. Stansfield of Illinois has conducted an instructive series of experiments, and melted more than 550 mixtures of rock materials. His results support the view that assimilation may be an important factor, but do not confirm many suggestions such as the formation of the nepheline-syenites by the assimilation of limestone.
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