"Lectures on Syphilis" by George Frank Lydston is a significant work in vintage sexology, offering a thorough exploration of syphilis as a sexually transmitted disease (STD) during the late 19th century. Lydston's lectures blend clinical observations with the moral and social concerns surrounding sexuality at the time. He examines the symptoms, progression, and treatment of syphilis, while also addressing its impact on both individual health and societal perceptions of sexual morality. Through the lens of vintage sexology, Lydston’s work reflects the period's views on sexuality and disease, making it an essential reference for understanding the historical context of STD management and the intersection of medicine and morality.