First published in 1941 as the revised edition of a 1938 original, this book presents a manual for the younger reader on the nature of magnetism and electricity. Historical detail is included to avoid an overly technical approach and to reflect the cultural aspects of science and scientific growth. Numerous illustrative figures are also contained throughout the text, together with questions and answers for students. This volume will be of value to anyone with an interest in books for schools, the development of scientific education and the history of science.