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Period: Feb 6, 1500 to
Evolution Of Cell Theory
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Hans and Zacharias Janssen
These two sacientists produced the first compound microscope by combining two convex lenses within a tube. -
Robert Hooke
An English scientist, he discovered a honeycomb-like structure in a cork slice using a primitive compound microscope. He names these 'cells'. -
Francesco Redi
An Italian physician, proved that flies only come from flies, disproving the theory of spontaneous generation. -
Anton Van Leeuwenhoek
A Dutch biologist, looks at pond water with a microscope he made lenses for. -
Anton Van Leeuwenhoek
Mr Leeuwenhoek writes a letter including detailed drawings of what he saw to the Royal Society after making several more discoveries on a microscpic level, including protozoa and bacteria. -
Lazzaro Spallanzani
An Italian biologist and abbot, discovered that soup that was kept sealed did not contain the micro-organisms that appeared in soup open to air. -
Robert Brown
English scientist Robert Brown discovers the nucleus in plant cells. -
Matthias Jakob Schleiden
A German botanist who proposes that all plant tissues are composed of cells, and that cells are the basic building blocks of all plants. -
Theodor Schwann
A German botanist who discovered that both plants and animals are made of cells.He also reorganized the previous statement on cells into one theory which states:
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 -
Rudolf Virchow
A German pathologist, published his aphorism 'omnis cellula e cellula' (every cell comes from another cell). In this, he theorizes that all forms of disease come from changes in normal cells.