Transcriber’s Notes:
Underscores _ before and after a word or phrase indicate _italics_
in the original text.
Equal signs = before and after a word or phrase indicate =bold=
in the original text.
Small capitals have been converted to SOLID capitals.
Illustrations have been moved so they do not break up paragraphs.
Deprecated spellings have been preserved.
Typographical and punctuation errors have been silently corrected.
The list of works by John Tyndall has been moved from the front to the
end of the file.
POPULAR LECTURES
ON
SCIENTIFIC SUBJECTS
BY
HERMANN VON HELMHOLTZ
TRANSLATED BY
E. ATKINSON, PH.D., F.C.S.
FORMERLY PROFESSOR OF EXPERIMENTAL SCIENCE, STAFF COLLEGE
SECOND SERIES
_WITH AN AUTOBIOGRAPHY OF THE AUTHOR_
[Illustration]
LONGMANS, GREEN, AND CO.
39 PATERNOSTER ROW, LONDON
NEW YORK, BOMBAY, AND CALCUTTA
1908
_All rights reserved_
_BIBLIOGRAPHICAL NOTE._
_Issued in Silver Library, March 1893; Reprinted
July 1895, May 1898, June 1900, December 1903,
August 1908._