Jr. James Weir

James Weir, Jr. (1856–1906) was an American physician and author from Kentucky. He is best known for writing accessible nonfiction that brought ideas about evolution, psychology, and animal behavior to a broad audience.

Among his notable books is The Dawn of Reason; or, Mental Traits in the Lower Animals (1899), which looks at intelligence, emotion, and instinct in animals. He also wrote on human motives and social behavior, showing a strong interest in how science could explain both mind and conduct.

Weir wrote during a period when readers were intensely interested in Darwinian thought and the emerging sciences of mind and behavior. Even now, his work offers a window into how writers at the turn of the 20th century tried to connect medicine, natural history, and everyday human questions.