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Sorby lie in the plane of cleavage; whereas in a similar rock not exhibiting cleavage they lie with their longer axes in all directions. May not their position in the slates have been determined by the movement of elongation before alluded to? To illustrate this theory some scales of oxide of iron were mixed with soft pipe- clay in such a manner that they inclined in all directions.
Kate did not resent this language; she even smiled, a little sadly. She had a great work before her, and she could not mind trifles. None of the other pirates came on board, for they were afraid of Sorby, and when that great man had made the round of the decks and had given Captain Ichabod some bits of advice, he got down into his boat.
If complex and enigmatical appearances did not present themselves, it would be a serious objection to the metamorphic theory. Mr. Sorby has shown that the peculiar structure belonging to ripple-marked sands, or that which is generated when ripples are formed during the deposition of the materials, is distinctly recognisable in many varieties of mica-schists in Scotland. Lamination of clay-stone.
Sorby, are those in which a liquid, on cooling, has become first viscous and then solid without crystallising or undergoing a definite change in its physical structure.
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