"Scientific American Supplement, No. 794, March 21, 1891" - a publication containing interesting and relevant articles from various fields of science. In this issue you will find new discoveries in the field of physics, chemistry, biology and other scientific disciplines. The authors of the articles carefully researched and analyzed the information, which gives readers the opportunity to improve their knowledge and understanding of important scientific issues. "Scientific American Supplement" is an inexhaustible source of new and interesting information for everyone who is interested in modern science and its achievements.