In the summer of 1831, when Snow was eighteen and in his fourth year as an apprentice, a cholera epidemic struck London. The disease had already killed hundreds of thousands of people in Europe.
John Snow Questions (Elementary) 1. How old was John Snow when he began to work as an apprentice for Dr. Hardcastle? 2. How many people died in the 1831-1832 cholera epidemic in England? 3. Doctors believes that ____ were the cause of cholera but Dr. Snow believed that _____ were the cause of cholera.