11Robert Hooke discovered and named cells in 1665 when he examined thin slices of cork with a compound microscope he designed.
12“Cells” got their name because they reminded Hooke of the small, boxy living quarters of monks.
13Perhaps inspired by Hooke, Anton van Leeuwenhoek took up microscopy and built more than 500 microscopes, grinding the lenses himself.
14This enabled him to discover and describe red blood cells and bacteria taken from scrapings off his teeth.
15Schleiden and SchwannSchleiden used microscopes to observe plant cells.Schwann observed animal cells under microscopes.Schleiden and Schwann summarized their observations and conclusions into the cell theory.
16VirchowApproximately 20 years later Virchow saw that cells could not develop from anything except other cells.