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This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Max Born (1882-1970) was a physicist and mathematician who won the 1954 Nobel Prize in Physics for his research in the area of quantum mechanics. Originally published in 1943, this book presents a slightly expanded version of an address Born gave to the Durham Philosophical Society and the Pure Science Society, King's College, at Newcastle-upon-Tyne on 21st May 1943. The text provides an examination of the mutual relationship between theory and experiment in the development of physics. This book will be of value to anyone with an interest in the works of Born, physics and the history of science.

The & Nobel Laureate discusses the foundations of quantum theory in two lectures, & one on the structure of the atom, the other on the lattice theory of rigid bodies.