The International Scientific Series

THE NEW PHYSICS AND ITS EVOLUTION

by

LUCIEN POINCARÉ
Inspéctéur-General de l'Instruction Publique

Being the Authorized Translation of _LA PHYSIQUE MODERNE, SON ÉVOLUTION_

New York
D. Appleton and Company

1909







Prefatory Note

M. Lucien Poincaré is one of the distinguished family of
mathematicians which has during the last few years given a
Minister of Finance to the Republic and a President to the
Académie des Sciences. He is also one of the nineteen
Inspectors-General of Public Instruction who are charged with the
duty of visiting the different universities and _lycées_ in