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A english man named Robert Hooke discovered small microscopic structures in a cork looking through a compound microscope (30X magnification) . Since it was dead tissue, he only saw the cell wall; so he coined the term cell as it reminded him of the cell of a monk.
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The theory of spontaneous generation was supported from the ancient romans to the 19th century. A greek philosopher named Aristotle supported the theory of Abiogenesis, how life can be created through a life force. Experiments were conducted that disproved the theory, but none were accepted.
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Italian physician and biologist Francesco Redi was the first scientist to preform controlled experiments, also first to question abiogenesis. In 1668, Redi questioned if maggots came from meat. He set out three jars: one sealed, one covered in gauze and one uncovered. Redi found that the maggots only formed on the uncovered meat, concluding that living organisms must come from living things.
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In 1674, Antoine van Leeuwenhoek observed green algae when looking at pond water through a microscope he invented(270X magnification). He called the algae animalcules.
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German botanist Matthias Jakob Schleiden created a part of the cell theory: all living things are made out of one or more cells, and plants and animals are made out of cells.
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Together with Schleiden, German physiologist Theodor Schwann cells, they developed part of the cell theory. Also, Theodor discovered Schwann cells. Schwann cells have the ability to create a sheath surrounding nerve axons. With this knowledge, he ran experiments that helped disprove spontaneous generation
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German physician, anthropologist, pathologist, prehistorian, biologist, writer, editor, and politician Rudolf Virchow completed the third part of the cell theory: All cells arise only from pre-existing cells. Additionally, he concluded that all diseases stem from a change in the normal cells.
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Born December 27, 1822, french chemist and biologist Louis Pasteur created a experiment to test spontaneous generation. In 1864, he put broth into a flask and bent the neck of the flask into a "s" shape so air could reach the broth but particles would get trapped in the "s". He tipped some broth into the bend, and as a result mold grew in the bend. Pasteur concluded that the microorganisms in the air created the mold in the broth, therefore spontaneous generation did not occur.
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http://a2.files.biography.com/image/upload/c_fit,cs_srgb,dpr_1.0,h_1200,q_80,w_1200/MTE5NTU2MzE2MzM5NTM3NDE5.jpg https://www.boundless.com/microbiology/textbooks/boundless-microbiology-textbook/introduction-to-microbiology-1/introduction-to-microbiology-18/pasteur-and-spontaneous-generation-205-5188/ https://www.google.com/webhp?sourceid=chrome-instant&ion=1&espv=2&ie=UTF-8#q=franceso%20redi
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http://www.softschools.com/timelines/cell_theory_timeline/96/
http://www.thefamouspeople.com/profiles/images/antonie-van-leeuwenhoek-3.jpg
http://study.com/academy/lesson/anton-van-leeuwenhoek-biography-cell-theory-discoveries.html
http://www.nndb.com/people/751/000278914/matthias-jacob-schleiden-2-sized.jpg
https://www.science-of-aging.com/timelines/images/Theodore-Schwann.jpg
https://en.wikipedia.org/wiki/Theodor_Schwann -
