THE behaviour of matter and energy represents one aspect only of human knowledge,
which is generally known by the name of physical science. It seems well to state at the outset …

energy became generally acknowledged, the conviction has also developed that this law
must serve as the foundation of the natural sciences, above all of physics. The realiza tion of …

Matter may be said to be defined by the attributes of impenetrability and extension; it also
has a number of properties, such as gravity or weight, repulsion, inertia, and living force …

HOW is it possible to understand life, when the whole world is ruled by such a law as the
second principle of thermodynamics, which points toward death and annihilation? This …

One need not be a poet or a mystic to find Blake's definition of energy more satisfying than
the defini tions given in textbooks on physics. Even within the framework of physical science …

IN these lectures we may take some of the initial steps toward an energy conception of
Evolution and an energy conception of Heredity and away from the matter and form …

Fifty years ago science seemed on the road to a clear-cut answer to the ancient question
which is the title of this article. It looked as if mat ter would be reduced at last to its ul timate …

THE volume now presented must be regarded as the opening one of a series forming a Text-
Book on Physics, which the authors are preparing. The second volume, that on Sound, has …

My intention in this book is to describe in simple language, using a minimum of mathematics
but a maximum of numerical values, the most important developments of science dealing …

Mr. Chairman, Ladies and Gentlemen, I feel deeply honoured at being asked to join the very
distinguished series of Guthrie lecturers. I have chosen a subject which at first sight seems …