Part II contains articles of a more general cultural interest. Some of these show that Bohr regarded the complementary perspective to be of value also outside the scientific sphere.
Part III contains the articles Bohr wrote about the great Danish philosopher Harald Høffding. These short papers are presented in a section on their own because of the continuing discussion in the history of science about Høffding's possible influence on Bohr's work in physics and his whole scientific approach.
Part IV comprises articles illuminating the history of 20th century physics. Bohr had great veneration for his predecessors and teachers, and he prepared these articles with great care.
Part V contains correspondence relating to the material in Parts I through IV. As in previous volumes an inventory of relevant unpublished manuscripts held at the Niels Bohr Archive constitutes an appendix to the whole volume.
Part I. COMPLEMENTARITY IN BIOLOGY AND RELATED FIELDS. Introduction. 1. Bohr's View on Biology. 2. Contemporaneous Discussions of Bohr's View. I Light and Life, Nature 131 (1933) 421-423, 457-459. II Causality and Complementarity, Phil. Sci. 4 (1937) 289-298. III Biology and Atomic Physics, ``Celebrazione del secondo centenario della nascita di Luigi Galvani'', Bologna - 18-21 ottobre 1937-XV: I. Rendiconto generale, Tipografia Luigi Parma 1938, pp. 68-78IV Analysis and Synthesis in Science, International Encyclopedia of Unified Science 1 (1938) 28. V Medical Research and Natural Philosophy, Acta Medica Scandinavica (Suppl.) 142 (1952) 967-972. VI Address at the Opening Ceremony, Acta Radiologica (Suppl.) 116 (1954) 15-18. VII Unity of Knowledge, ``The Unity of Knowledge'' (ed. L. Leary), Doubleday & Co., New York 1955, pp. 47-62. VIII Physical Science and Man's Position, Ingeniøren 64 (1955) 810-814. IX Preface and Introduction, ``Atomic Physics and Human Knowledge'', John Wiley & Sons, New York 1958, pp. v-vi, 1-2. X Physical Science and the Problem of Life, ``Atomic Physics and Human Knowledge'', John Wiley & Sons, New York 1958, pp. 94-101. XI Quantum Physics and Biology, Symposia of the Society for Experimental Biology, Number XIV: ``Models and Analogues in Biology'', Cambridge 1960, pp. 1-5. Editor's Note. XII Physical Models and Living Organisms, ``Light and Life'' (eds. W.D. McElroy and B. Glass), The Johns Hopkins Press, Balti