Scientific American Supplement, No. 787, January 31, 1891

Step into a bustling world of late‑19th‑century discovery, where each article opens a fresh window onto the era’s most vibrant ideas. From a vivid portrait of the man behind vulcanized rubber to a lively debate on whether animals can truly be separated from plants, the collection blends biography, biology and spirited scientific argument. Readers will also meet inventive engineers showcasing electric ballistic targets for West Point, novel lighting tools for geologists, and a clever method for trisecting any angle using hyperbolas.

Beyond the laboratory, the supplement explores practical marvels: a proposed testing station for farm machinery, detailed accounts of French ironclad warships, and ingenious water‑softening systems for sewage treatment. Entomologists discuss the promise of potash salts as insecticides, while mathematicians and insurers unpack complex calculations that shape everyday life. All of this is presented in clear, engaging prose, inviting listeners to travel through the diverse curiosities that defined a transformative moment in scientific history.