An Introduction to the Study of Rocks and Guide to the Museum Collection (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from An Introduction to the Study of Rocks and Guide to the Museum Collection

This Guide-book has been designed on the same general plan as the Introductions to the Study of Meteorites and Minerals, published in 1881 and 1884, respectively. It attempts to give, from a Museum point of view, a simple sketch of the relationships of Rocks, indicating at the same time all the more important characters and pointing out their significance.

In a perfect Introduction mere speculation would be avoided; and only statements would be made of which the accuracy could be proved, or at any rate suggested, by means of specimens small enough to be exhibited in proper sequence in the Cases of a Museum. Further, an ideal Introduction would be brief; and yet so far explanatory as to be easily understood by every Visitor who has had a general education and is willing to give a moderate amount of thought to the subject.

But there are practical difficulties in the preparation of such a Guide-book; the whole of a rock-mass cannot be exhibited in a Museum, the causes of various characters or changes cannot be shown in actual operation, and many rocks require microscopic examination or chemical analysis for their dis crimination: yet an Introduction even distantly approaching the above ideal will doubtless be of service to those who come to study the Mineral Collections of the Natural History Museum.

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