Originally published in 1952, as part of the Cambridge Monographs on Physics series, this book was developed to provide a survey of experiments in nuclear physics. It constitutes an attempt to discover how far it is possible to come near to an understanding of the stability properties of nuclei in their lowest states. The text was written by the renowned nuclear physicist Norman Feather (1904-78). The book will be of value to anyone with an interest in nuclear physics and the history of science.