and for his permission to draw on unpublished material from his dissertation
(Cambridge University, 1955) for Sections 3.4 and 4.5. We deeply appreci-
ate the thoughtful kindness of Professor S. Schwarz and the Central Library
of the Slovakian Academy of Sciences for sending us (unsolicited) a photo-
stat print of Suschkewitsch's book. Our thanks go also to Mrs. Anna L.
McGinity for typing all of Volume 1. Finally, the authors gratefully acknow-
ledge partial support for this work from the National Science Foundation
A. H. C.
G. B. P.
July 28, 1960
T H E TULANE UNIVERSITY OF LOUISIANA
TH E ROYAL MILITARY COLLEGE OF SCIENCE