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FELLOW AND TUTOR OF TRINITY COLLEGE, CAMBRIDGE ; PRESIDENT OF THE GEological,
Society of London.

IN THREE VOLUMES.

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LONDON :

JOHN W. PARKER, WEST STRAN D.
CAMBRIDGE: J. AND J. J. DEIGHTON.
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M.DCCC.XXXVII ...

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TO

SIR JOHN FREDERICK WILLIAM HERSCHEL, R. G. H.

My DEAR HERSCHEL,

It is with no common pleasure that I take up my pen to dedicate these volumes to you. They are the result of trains of thought which have often been the subject of Our conversation, and of which the origin goes back to the period of our early companionship at the University. And if I had ever wavered in my purpose of combining such reflections and researches into a whole, I should have derived a renewed impulse and increased animation from your delightful Discourse on a kindred subject. For I could not have read it without finding this portion of philosophy invested with a fresh charm; and ticugh I might be well aware that I coast nović to that large share of popularity which your work & itly 'gained, I should still have reflected, that something was due td the subject itself, and should have hoped that my own aim was so far similar to yours, that the present work might have a chance of exciting an interest in some of your readers. That it will interest you, I do not at all hesitate to believe.

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