1 janv. 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)Ajouté au bande de temps:
Date:
1 janv. 1898
Maintenaint
~ Il y a 126 ans
