"Appletons Popular Science Monthly, December 1899, Volume LVI: November 1899 - April 1900" is a collection of the most brilliant scientific articles from the sixth volume of the popular magazine. In this issue you will find interesting materials from various fields of science - from astronomy and physics to biology and geography. Readers will be able to familiarize themselves with the cutting-edge scientific research of the time and expand their knowledge of nature and society. Appletons is not just a magazine, but a source of inspiration and knowledge for anyone interested in science and discovery.