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385 BCE
Aristotle (385 BC-322 BC)
Aristotle was the first person to have ideas of cell theory, he started a theory and experimented with it. ¨Through his study of chick embryos, Aristotle articulated principles of generation to account for the theory that developing organisms go through a series of stages before acquiring their final form.¨ He called this experiment ¨epigenesis.¨ -
1580
Jan Baptist van Helmont (1580-1644)
Jan made a contribution to the cell theory by studying photosynthesis. ¨Jean discovered that the mass of the entire plant was far more than the weight of the displaced original pounds of soil.¨ -
Zacharias Jansen (1585–1632)
Zacharias Jansen contributed to the cell theory by inventing the revolutionary compound optical microscope. -
Antoni van Leeuwenhoek (1632-1723)
He made use of a microscope containing improved lenses that could magnify objects almost 300-fold, or 270x. -
Robert Hooke (1635-1703)
Robert Hooke contributed to cell theory by discovering the object in the microscope that he could only describe as a cell. -
Robert Brown (1773-1858)
Robert Brown contributed to cell theory by discovering the part of the cell known as the nucleus. -
Lorenz Oken (1779_1851)
Lorenz Oken contributed to cell theory by coming up with the conclusion that "All living organisms originate from and consist of cells" -
Matthias Jakob Schleiden (1804-1881)
Matthias Jakob Schleiden contributed to cell theory by coming up with the conclusion that ¨All plant tissues are composed of cells.¨ -
Theodor Schwann (1810-1882)
Theodor Schwann contributed to cell theory by concluding ¨that all tissues are made up of cells.¨ -
Albrecht von Roelliker (1817-1905)
Albrecht von Roelliker contributed to cell theory by helping ¨to confirm the view that cells arise only from other cells.¨ -
Rudolf Virchow (1821-1902)
Rudolf Virchow contributed to cell theory by using ¨the theory that all cells arise from pre-existing cells to lay the groundwork for cellular pathology.¨ -
Louis Pasteur (1822-1895)
Louis Pasteur contributed to cell theory by ¨disproving spontaneous generation.¨
