With the simple microscope Leeuwenhoek before 1673 had studied the structure of minute animal organisms and ten years later had even obtained sight of bacteria. 李贝.西洋科学史.
Presently the Dutchman, Leeuwenhoek (1632-1723) brought the first crude microscope to bear upon the hidden minuti? of life. 赫伯特·乔治·威尔斯.世界史纲.