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