This book includes essays that emphasize the part played by pre-existing images or archetypes in the development of concepts and scientific theories and stress the need for complementary principles in nature. It is a translation of "Synchronizitat als ein Prinzip akausaler Zusammenhange".  In 1952 Carl Jung and Wolfgang Pauli, both at the height of their reputations, co-wrote The Interpretation of Nature and the Psyche. It contained one essay by each author: Jung's presents a challenge to mainstream science and advances the principle of synchronicity and Pauli's argues for a more holistic conception of modern science. Roderick Main presents the original essays here with a brand-new introduction and commentary which reviews how the original text was viewed, and which traces the subsequent influences of both the essays and the two authors.