Essay Title/Question: Explain the importance of John Snow's work in improving medicine during the 19th century.

Introduction Thesis:

Outline the key idea that John Snow's pioneering work revolutionized public health and epidemiology.

Point 1 with Evidence:

Question: Outline how Snow's investigation of the Broad Street cholera outbreak demonstrated his innovative approach. Answer: Snow used mapping and data collection to identify the source of cholera, which was a new method at the time and helped to prove the link between contaminated water and disease.

Point 2 with Evidence:

Question: Explain how Snow's work influenced future medical practices and public health measures. Answer: His work led to improvements in sanitation and water supply systems, and established epidemiology as a scientific discipline.

Counter-argument:

Question: Compare some criticisms of Snow's methods with his achievements. Answer: Critics argued Snow's approach was limited because it focused on one outbreak, but his overall influence proved to be a turning point in disease prevention.

Conclusion:

Question: Summarize why John Snow's contributions are considered crucial in 19th-century medicine. Answer: Snow's innovative use of evidence-based methods and his impact on public health policies significantly advanced medical understanding and practice during the period.