John Snow, Asiatic Cholera and the inductive-deductive method

Lecture 7: Changes in the water intake and table of mortality by source

The possibility of testing his first hypothesis came about with the change of the boundaries and water collection inlets in South London, around the Southwark area, in what Snow called the “great experiment” or sometimes the “natural experiment”.

In the 26 November publication, the Registrar-General reports on the change in temperature and the increase i…