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Zacharius Janssen was born in Middleburg, The Netherlands. His exact sate of birth is unknown. His occupation was a spectacle maker.
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Zacharias Janssen invented the first compound microscope in the 1590s, when he discovered how multiple lenses made objects appear larger. The compound microscope could magnify objects to a greater power then most single lense microscopes.
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Anton Van Leeuwenhoek was born in Delft, The Netherlands. His occupations were buisnessman, Physicist, Biologist, and Microscopist
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Robert Hooke was born in the Isle of Wight, England. His occupations include Scientist, and Microscopist
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In 1638, Zacharias Janssen dies. The exact date of his death is unknown.
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Robert Hooke observed a cork in 1665, and noticed how it contained cells. He contributed the word "cell". He also discovered plant cells.
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Anton Van Leeuwenhoek was the first to observe and describe cells in a drop of pond water, using his own single lense microscopes, in which he used nearly perfect lenses.He was the first to observe Bacteria and Protozoa, both of which are single celled organisms.
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In 1683, Anton Van Leeuwenhoek writes a letter to the royal society describing his discovery of Bacteria and Protozoa. The royal society publishes his discovery.
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In 1703, Robert Hooke dies. The exact date of his death is unknown.
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In 1723, Anton Van Leeuwenhoek dies. The exact date of his death is unknown.
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Matthias Schleiden was born in Hamburg, Germany. His occupation was a Botanist.
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Theodore Schwann is born in Neuss,Germany His occupations include biologist, physiologist
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Rudolph Virchow is born in Schivelbain, Pomerania, modern day Swidwin, Poland. He spent the majority of his life in Germany. His occupations include anthropologist, pathologist, physician, and physiologist
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In 1837, Matthias Schleiden stated that plant growth occured with the production of new cells.
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In 1838 Matthias Schleiden concluded that all plant tissues are made of cells,and that embryonic plants arose from a single cell.
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Theodore Schwann concluded that animal tissue is made of cells. He also concluded that animals and plants have different cell structures. His first law of cell theory is that organisms are made of one or more cells. His second cell theory is that a cell is the basic unit of life.
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Rudolph Virchow adds the third cell theory which states that all cells develop only from existing cells. He was the first to demonstrate that cell theory applies to diseased tissue and healthy tissue. Diseased cells derive from healthy cells of normal tissue.
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In 1882, Theodore Schwann dies. The exact date of death is unknown.
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Rudolph Virchow dies in 1902. The exact date of his death is unknown.
