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  1. History of the Cell Theory All living organisms are composed of cells, and all cells arise from other cells. These simple and powerful statements form the basis of the cell theory, first formulated by a group of European biologists in the mid-1800s.

  2. Brown descibed the cell nucleus in cells of the orchid. 1838: Schleiden and Schwann proposed cell theory. 1840: Albrecht von Roelliker realized that sperm cells and egg cells are also cells. 1856: N. Pringsheim observed how a sperm cell penetrated an egg cell. 1857

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  4. 1833 – Brown descibed the cell nucleus in cells of the orchid. 1838 – Schleiden and Schwann proposed cell theory. 1840 – Albrecht von Roelliker realized that sperm cells and egg cells are also cells. 1856 – N. Pringsheim observed how a sperm cell penetrated an egg cell.

  5. A prokaryote History The cell was discovered by Robert Hooke in 1665. He examined (under a coarse, compound microscope) very thin slices of cork and saw a multitude of tiny pores that he remarked looked like the walled compartments of a honeycomb. Because of this association, Hooke called them cells, the name they still bear.

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  6. Cell Theory Timeline Timeline Description: Before 330+ years ago, there was no knowledge of cells. Cells were too small to be seen. But with the invention of the microscope, an entirely new world was discovered, where very large objects like humans are in fact made up of billions of tiny individual pieces called cells. Loading Timeline...

  7. Rudolf Albert von Kölliker. Rudolf Virchow. Nathanael Pringsheim. Albrecht von Roelliker. Theodor Schwann. Matthias Schleiden. Robert Brown. Anton van Leuwen...

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