John Snow, Asiatic Cholera and the inductive-deductive method

Lecture 5: Disseminated source outbreaks

“The duration of cholera in a place is usually in direct proportion to the number of the population”

We saw in Lecture 3 that Snow deduced by the presence of an incubation period that the morbid poison of cholera needed time to replicate.  Now he makes a further deduction (page 56).

Snow deduced that it must resemble a cell as it reproduces itself inside …