Logical Positivism is the second in a series of books which will make
available to the general public some of the most interesting work
of philosophers of very diverse viewpoints. Each volume will deal
with one or, in some cases, with two, philosophical "schools" or
"movements." It is fortunate that philosophers are rarely united by
the kind of common purpose which inspires political or religious
"movements." Nevertheless, it is frequently helpful to consider the
work of different writers according to the similarities in their aim
and content; and this is the policy which has been adopted in de-
signing the Library of Philosophical Movements.

This volume presents, for the first time in English, many of the
most influential papers by leading members of the Vienna Circle.
These and other articles contain authoritative expositions of the
doctrines most commonly associated with logical positivism. How-
ever, for reasons explained by Professor Ayer in his introduction,
several pieces which cannot be regarded as expositions or defenses
of logical positivism have also been included. The scope of the
bibliography, too, is broader than the title of the book would sug-
gest. No volume dealing with other forms of analytic philosophy is
contemplated in this series and it was therefore thought desirable
to list the most important books and articles dealing with all types
of analytic philosophy and not only with logical positivism.

I wish to express my gratitude to all the translators who gen-
erously contributed their labor, to Marvin Zimmerman, James Bayley,
Irving Saltzmann, and a number of my students for helping to com-
pile the bibliography, and to Leon Satinoff, Maxwell Grober, and
José Huerta-Jourda for preparing the index. Special thanks are due
to Professors Carnap and Hempel for supplying notes which indi-
cate their present position on the issues dealt with in their papers.
Professor Carnap was also kind enough to assist in the translation
of his own articles.

PAUL EDWARDS

-v-