Horatio Curtis Wood Jr.

American physician and naturalist (1841–1920).

Horatio Curtis Wood Jr. (January 13, 1841 – January 3, 1920) was an American physician and biologist. Born into a wealthy Pennsylvania family, he attended the Medical Department of the University of Pennsylvania, and after serving as a surgeon in the American Civil War, continued to teach at the university. A member of the National Academy of Sciences, he was known for his 1874 text Treatise on Therapeutics, which became a widely used medical textbook, and also for his botanical and zoological work: writing on freshwater algae, fossil plants, arachnids, and myriapods.