first to describe living microscopic organism

invented single lens microscope

considered "Father of Microbiology"

1. guidelines for naming organisms
2. ninomial system of nomenclature
3. genus- group of related species
4. species- group of individuals which can interbreed and produce gertile offspring
5. 2 million species

• First vaccination
• demonstrated cow pox induced resistance to small pox in uninfected humans

1. disproved principle of spontaneous generation
2. life does not arise from non living things
3. fermentation caused by microo