in London. B. The cause of Cholera wrce of all drinking water should
be examined. D. How John Snow collected, analysed
data and found the cause of the disease and defeated the disease.
What happened to the water in the pump?
The water was from the river _p_o_l_l_u_te__d_ by the dirty water from London.
What extra evidence did he find?
John Snow was a well-known _d_o_c_t_or_ in London in the 1_9_t_h century. He wanted to find the _c_a_u_se_of cholera in order to _d_e_fe_a_t_ it. In 1854 when a cholera _b_r_o_k_e out, he began to gather information. He _m_a_r_k_e_d on a map where all the dead people had lived and he found that many people who had drunk the dirty water from the _p_u_m_p_ died. So he decided that the polluted water carried cholera. He suggested that the _s_o_ur_c_e_ of all water supply be _ex_a_m__in_e_d_. Finally, “King Cholera” was defeated.