The Scientific American Popular Science Supplement, No. 312, December 24, 1881, consists of interesting scientific articles covering a wide range of topics, from physics and chemistry to technology and medicine. This edition contains a variety of materials written by experts in their field. Readers will have the opportunity to learn about the latest discoveries and achievements of modern science, as well as better understand important aspects of the development of technology and scientific research in the 19th century. The book will inspire new learning and expand the worldview of anyone interested in science and technology.