jan 1, 1898 - Simmond shows how plague is spread
Description:
Paul-Louis Simmond conducts and experiment and demonstrates that the plague is spread by fleas not miasma (pictured: Simmond placed two rats in a box, one with infected fleas one without, at the end both rats became infected)Added to timeline:
Date:
jan 1, 1898
Now
~ 127 years ago