1 ene 1898 año - Simmond shows how plague is spread
Descripción:
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)Añadido al timeline:
fecha:
1 ene 1898 año
Ahora mismo
~ 127 years ago