Establishment of Germ Theory A Dutch cloth merchant used new method or grinding and polishing tiny lenses of great curvature which gave magnifications up to 270 diameters First to see and describe bacteria as animalcules小动物 Leeuwenhoek /*3Yi became the pioneer of microbIology Antonie van Leeuwenhoek 1632-1723 等动Establishment of Germ Theory Antonie van Leeuwenhoek 1632-1723 A Dutch cloth merchant used new method for grinding and polishing tiny lenses of great curvature which gave magnifications up to 270 diameters First to see and describe bacteria as animalcules 小动物， Leeuwenhoek became the pioneer of microbiology