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Period: to
Cell Theory Development
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Aristotle's Observations (date not accurate, used to keep scale reasonable)
Actual date would be around 340 B.C. Aristotle observed preformation and epigenisis when theorizing how animals and plants developed. Preformation is the theory that a sperm or other cell is a miniature version of the animal and will grow when properly stimulated. Epigenisis is the theory that animals develope from similar parts or other animals. Like and Eel from a worm. Or an ostrich's neck from a giraffe. -
Hooke's Discoveries
In September 1665, Robert Hooke published a book titled "Micrographia" It contained drawings of small objects that he viewed through his microscope. With this publication he coined the term, "Cell". He called them cells because he noticed in his analyzation of plants that they resembled monks' cells in a monastery. -
Antony van Leeuwenhoek's Discovery
Leeuwenhoek was the first person to view and describe a single celled organism. He studied blood cells, small aquatic organisms and matter scraped from his teeth under special lenses that he created himself. He called them animalcules, the first amoebas. -
Robert Brown's discovery
When Robert Brown was viewing grains of pollen through a microscope he noticed that they were all shaking and moving slightly. He hypothesized that the pollen must be alive. He then observed dust particles under the microscope and noticed the same thing. This ruled out the hypothesis. Although Brown didn't give a theory for the motion, it was still dubbed "Brownian Motion" -
Schleiden & Schwann's Discovery
Schleiden & Schwann compared their works and found many things about cell theory. The noticed that in young cells there were neuclei, and then from more observation they concluded that new cells come from the nucleus. Schwann,based on his own work, argued that all organisms contained cells. He stated what came to be known as cell theory: All organisms are composed of 1 or more cells. -
Rudolf Virchow's "discovery"
Rudolf was one of the first to agree with Robert Remack's theory of cell devision. At first Rudolf thought that the theory only applied to certain cells, but upon the realization that Remack might be correct, he plagerized the work and created the epigram, "Omnis cellula e cellula" ("every cell originates from another existing cell like it.")
