Cell Theory

The start of spontanous generation

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answers.com Aristotle compiled and expanded the work of prior natural philosophers and the various ancient explanations of the appearance of organisms; it held sway for two millennia. He was a big supporter of spontanous generation.

First microscope invented

Nov 6, 1595

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Zacharias Jansen invented optical microscope. This revolutionized cell theory because now you can view cells and objects closer up. They created the compound microscope, allowing people to better analyze and understand the complexity of cells. He did not support spontanous generation.

conducted an experiment for spontanous generation

Nov 7, 1640

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Jan Baptist van Helmont performed experiments to prove that spontanous generation was true. He did an experiment saying a willow tree when it grows in size and bulk, the soil will increase in mass.

cells in a piece of cork

Nov 10, 1663

answers.com Robert Hooke discovered cells in a piece of cork,which he examined under his primitive microscope. Actually, Hooke only observed cell walls because cork cells are dead and without cytoplasmic contents. Hooke coined the word “CELL”. He did support spontanous generation

compound microscope invented

Nov 7, 1674

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Leeuwenhoek made microscopes consisting of a single, high-quality lens of very short focal length; at the time, such simple microscopes were preferable to the compound microscope,

discovering the nucleous

Nov 7, 1831

http://wiki.answers.com/ Robert Brown discovered, and named the nucleus of cells. He did not support spontanous generation.

Plants have cells

Nov 10, 1838

answers.com Matthias Schlieden investigated plants microscopically and conceived that plants were made up of recongnizable units, or cells. He did not support spontanous generation.

Created cell theory

Nov 6, 1839

Theodor Schwann concluded that all animals are made of cells and came up with the cell theory with Schleiden. He discovered that animals are made up of cells in 1838. He did not support spontanous generation.

idea of cells come from pre-existing cells

Nov 7, 1855

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Rudolph Virchow suggested that all cells come from pre-existing cells. His aphorism'omnis cellula e cellula' meaning every cell from a pre-existing cell became the foundations of division, even if the process was not fully understood then. He also stated that not all plants are made up of cells,which process was not fully understood then. This eventually lead to the creation of cell theory. He did not support spontanous generation.

Cells dividing

Nov 10, 1858

http://science.howstuffworks.com/ Louis Pasteur became the first to show that living things come only from living things. He demonstrated that the microorganisms would grow in sterilized broth only if the broth was first exposed to air that contained their spores (reproductive cells). He did not support spontanous generation.

cells cannot be generated from other cells

Nov 10, 1888

http://www.bookrags.com/ Albrecht Von Roelliker helped to confirm the view that cells arise only from other cells and cannot be generated from non-cellular material. He also advocated the view that tissue should be studied and understood as a mass of individual cells. He did not support spontanous generation.