First published under the auspices of The London Institute of World Affairs in
1950. With a supplement, Recent Trends in the Law of the United Nations [1951].

"[A] number of reasons why this book is bound to appeal to delegates as
a source of quotation. One such reason obviously is the international
reputation of its author, particularly his prestige in European and Latin
American countries. Another is the comprehensive and systematic
character of the book, which covers almost all of the basic legal problems
presented by the Charter. Most important, perhaps, is the fact that
delegates - and other readers - are likely to be impressed with the
fundamental approach of the book: its close analysis of the structure
of rules and their inter-relationships; the eschewing of political and
ideological considerations; the emphasis on legal duties rather than
purpose and functions; the awareness of the creative role played by
the law-applying organs. These guiding principles (which are derived
from, though not logically dependent on, Kelsen's pure theory) are
welcome elements in a study of this kind; they promise objectivity,
toughmindedness and technical skill, attributes which in a legal treatise
will command more respect than idealism or imagination. For these
reasons, the book may exert a significant influence of developments in
the United Nations." --Oscar Schachter, 60 Yale Law Journal 1951, 189-190.

Possibly the most influential jurisprudent of the twentieth century, HANS
KELSEN [1881-1973] was legal adviser to Austria's last emperor and its first
republican government, the founder and permanent advisor of the Supreme
Constitutional Court of Austria, and the author of Austria's Constitution, which
was enacted in 1920, abolished during the Anschluss, and restored in 1945. He was the author of more than forty books on law and legal philosophy. Active as a teacher in Europe and the United States, he was dean of the Law Faculty of the University of Vienna and taught at the Universities of Cologne and Prague, the Institute of International Studies in Geneva, Harvard, Wellesley, the University of California at Berkeley, and the Naval War College.