"Scientific American supplement, No. 821, issue of September 26, 1891" is a publication that contains a wide range of interesting articles from various fields of science and technology. Readers will have the opportunity to learn about the latest discoveries and achievements in the field of physics, chemistry, biology and other scientific disciplines. In this issue, you will find interesting materials about new methods of galaxy research, a description of inventions in the field of mechanical engineering, as well as reports on the latest discoveries in the field of medicine and pharmacy. Book Scientific American Supplement, No. 821, September 26, 1891 is an important source of information for anyone interested in science and technology of the late 19th century and wishing to expand their knowledge in these fields.