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Extract from beginning of chapter:

GRADUATE STUDY AT YALE

My first vivid impression of petrography as a definite study in itself was gotten by watching George Hawes1 working with a microscope over thin sections of granite from New Hampshire. His enthusiasm, his radiant smile, the glow of his blushing cheeks, and the merry twinkle of his bright eyes as he turned from the microscope to explain its uses in determining the minerals, brilliantly illuminated like bits of stained glass in a church window, were my introduction to what seemed to me a most interesting subject. This was in 1878...

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