EBOOK SIX LECTURES ON LIGHT ***
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SIX LECTURES ON LIGHT
DELIVERED IN THE UNITED STATES
IN
1872-1873
BY
JOHN TYNDALL, D.C.L., LL,D., F.R.S.
LATE PROFESSOR OF NATURAL PHILOSOPHY IN THE
ROYAL INSTITUTION OF GREAT BRITAIN
[Illustration: Sir Thomas Laurence PRA Pinx
Henry Adlarc. Sc.
Signature: Thomas Young]
London: Longmans & Co.
_SIXTH IMPRESSION_
LONGMANS, GREEN, AND CO.
39 PATERNOSTER ROW, LONDON
NEW YORK AND BOMBAY
1906
PREFACE TO THE FOURTH EDITION.
In these Lectures I have sought to render clear a difficult but
profoundly interesting subject. My aim has been not only to describe
and illustrate in a familiar manner the principal laws and phenomena
of light, but to point out the origin, and show the application, of
the theoretic conceptions which underlie and unite the whole, and
without which no real interpretation is possible.
The Lectures, as stated on the title-page, were delivered in the
United States in 1872-3. I still retain a vivid and grateful
remembrance of the cordiality with which they were received.
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