literature of applied political psychology. But readers who are not
politicians will find particular points dealt with in the works of the
late Monsieur G. Tarde, especially _L'Opinion et la Foule_ and _Les Lois
de l'Imitation_ and in the books quoted in the course of an interesting
article on 'Herd Instinct,' by Mr. W. Trotter in the _Sociological
Review_ for July 1908. The political psychology of the poorer
inhabitants of a great city is considered from an individual and
fascinating point of view by Miss Jane Addams (of Chicago) in her
_Democracy and Social Ethics_.

GRAHAM WALLAS.




PREFACE TO THE SECOND EDITION


I have made hardly any changes in the book as it first appeared, beyond
the correction of a few verbal slips. The important political
developments which have occurred during the last eighteen months in the
English Parliament, in Turkey, Persia, and India, and in Germany, have
not altered my conclusions as to the psychological problems raised by
modern forms of government; and it would involve an impossible and
undesirable amount of rewriting to substitute 'up-to-date' illustrations
for those which I drew from the current events of 1907 and 1908. I
should desire to add to the books recommended above Mr. W. M'Dougall's
_Social Psychology_, with special reference to his analysis of Instinct.

G.W.