[Translated from the French by G.M. Temmer]. Translated from the French by J. Potter. Translated from the French by Elisabeth Abbott. Translated from the Russian by N. Kemmer. . Translated from the Russian by G. Leib. Translated from the French by Scripta Technica, inc. Translated from the German by Ralph E. Oesper. Translated from the Russian by A.H. Armstrong. Translated from the German by P. O. Wolf. Yves Rocard ; translated from the French by M.L. Meyer.