These 1911 maps and scientific plates document the Indian plague investigations in Bombay during the Third Plague Pandemic. Investigators combined controlled experiments with painstaking house-by-house fieldwork: trapping and examining rats, deploying sentinel guinea-pigs, recording human cases and plotting dates and locations of infection across Fort, Sion, Wadala, Parel and Worli. Their purpose was to determine how bubonic plague moved through densely populated neighbourhoods and why human outbreaks followed waves of rat mortality. The resulting sequence of dot maps made chronological relationships visible, while experimental work confirmed the Oriental rat flea as the vector. Together the reports supplied systematic epidemiological proof of the rat–flea–human chain of transmission—one of the foundational achievements of modern disease ecology and an important early use of mapping in epidemic investigation.
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