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Robert Hooke
Discovered a honeycomb-like structure in a cork slice using a microscope. He only saw the cell walls (it was dead tissue). He named what he saw the cell. Robert Hooke first described cells in 1665. The open spaces Hooke observed were empty, but he and others suggested these spaces might be used for fluid transport in living plants.Olympia, Morgan. “The Cell Theory: Timeline.” Prezi.com, Morgan Olympia, 21 Nov. 2013, https://prezi.com/vt7bhxjvzqdr/the-cell-theory-timeline/. -
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Anton van Leeuwenhoek
He made several more discoveries on a microscopic level, eventually publishing a letter to the Royal Society.Among these was the first protozoa and bacteria that he discovered. Leeuwenhoek published his observations of single-cell organisms, or "little animalcules" as he called them.Olympia, Morgan. “The Cell Theory: Timeline.” Prezi.com, Morgan Olympia, 21 Nov. 2013, https://prezi.com/vt7bhxjvzqdr/the-cell-theory-timeline/. -
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Robert Brown
He discovered the nucleus in the plant cell. He was best remembered for discovering the random "Brownian" motion of molecules. Olympia, Morgan. “The Cell Theory: Timeline.” Prezi.com, Morgan Olympia, 21 Nov. 2013, https://prezi.com/vt7bhxjvzqdr/the-cell-theory-timeline/. http://www.softschools.com/timelines/cell_theory_timeline/96/ -
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Matthias Jakob Schleiden
He proposes that all plant tissues are composed of cells, and that cells are the basic building blocks of all plants. Olympia, Morgan. “The Cell Theory: Timeline.” Prezi.com, Morgan Olympia, 21 Nov. 2013, https://prezi.com/vt7bhxjvzqdr/the-cell-theory-timeline/. http://www.softschools.com/timelines/cell_theory_timeline/96/ -
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Theodor Schwann
He reached the conclusion that plants and animal are composed of cells.This ended debates that plants and animals were different in structure. He also pulled together and organized these statement on cells into one theory.1 - Cells are organisms and all organisms consist of one or more cells 2 - The cell is the basic unit of structure for all organisms.Olympia, Morgan. “The Cell Theory: timeline.” Prezi.com, Morgan Olympia, 21 Nov. 2013, https://prezi.com/vt7bhxjvzqdr/the-cell-theory-timeline/. -
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Rudolf Virchow
He added the 3rd part to the cell theory and it states Omnis cellula e cellula. This translates as all cells develop only from existing cells. Virchow was also the first to propose that diseased cells come from healthy cells. Olympia, Morgan. “The Cell Theory: Timeline.” Prezi.com, Morgan Olympia, 21 Nov. 2013, https://prezi.com/vt7bhxjvzqdr/the-cell-theory-timeline/. http://www.softschools.com/timelines/cell_theory_timeline/96/
