sent little volume, which speaks of psychology's possible
service to social sanity. I cannot promise that even this will be the
last, as I have not yet touched on psychology's relation to religion,
to art, and to politics.

The field which I have approached this time demanded a different kind
of treatment from that in the earlier books. There I had aimed at a
certain systematic completeness. When we come to the social questions,
such a method would be misleading, as any systematic study of these
psychological factors is still a hope for the future. Many parts of
the field have never yet been touched by the plow of the psychologist.
The only method which seems possible to-day is to select a few
characteristic topics of social discussion and to outline for each of
them in what sense a psychologist might contribute to the solution or
might at least further the analysis of the problem. The aim is to show
that our social difficulties are ultimately dependent upon mental
conditions which ought to be cleared up with the methods of modern
psychology.

I selected as illustrations those social questions which seemed to me
most significant for our period. A few of them admitted an approach
with experimental methods, others merely a dissection of the
psychological and psychophysiological roots. The problems of sex, of
socialism, and of superstition seemed to me especially important, and
if some may blame me for overlooking the problem of suffrage, I can at
least refer to the chapter on the jury, which comes quite near to this
militant question.

Most of this material appears here for the first time. The chapter on
thought transference, however, was published in shorter form in the
_Metropolitan Magazine_, that on the jury, also abbreviated, in the
_Century Magazine_, and that on naive psychology in the _Atlantic
Monthly_. The paper on sexual education is an argument, and at the
same time an answer in a vivid discussion. Last summer I published in
the New York _Times_ an article which dealt with the sex problem. It
led to vehement attacks from all over the country. The present long
paper replies to them fully. I hope sincerely that it will be my last
word in the matter. The advocates of sexual talk now have the floor;
from now on I shall stick to the one policy in which I firmly believe,
the policy of silence.

HUGO MUeNSTERBERG.

Cambridge, Mass., January, 1914.