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In 1590's, two Dutch spectacle makers, Zacharias Jansen and his father Hans experimented with lenses and put several lenses in a tube to discover the microscope. http://www.history-of-the-microscope.org/history-of-the-microscope-who-invented-the-microscope.php
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Around 1620, the physician and early chemist Jan Baptista van Helmont published this recipe for making mice: Dirty laundry+wheat+21 days=mice. He got these ideas from Aristotle because they were both believing in spontanious generation. http://evolutionwiki.org/wiki/Abiogenesis
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Robert Hooke gave cells their name. http://www.pisgahscience.com/holmescc/module4/cell_theory.swf
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In 1678 Anton van Leeuwenhoek reported to the Royal Society that he had discovered "little animals" bacteria and protozoa in various samples. http://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm
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In 1805 german naturalist Lorenz Oken suggests a primitive form of cell theory in a book entitled Die Zeugung (The Conviction). Oken proposes that all organic beings originate from and consist of vesicles or cells. http://www.lifesciencesfoundation.org/events-Primitive_cell_theory.html
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In 1831 Robert Brown observes that all cells from a variety of
backgrounds seem to contain a dark region near the
centre known as the nucleus. http://hrsbstaff.ednet.ns.ca/cchriste/cell theory ppt for web.pdf -
Edmund Beecher Wilson talked about cell theory. http://www.britannica.com/EBchecked/topic/101517/cell-theory
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Botanist Matthais Schleiden and Zoologist Theodor Schwann both got similar discoveries that both plants and animals are made up of cells. http://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm
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In 1840 Albrecht von Roelliker realized that sperm cells and egg cells are also cells. http://www.smithlifescience.com/celltheory.htm
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In 1858, Rudolf Virchow extended the work of Schleiden and Schwann by proposing that all living cells must rise from pre-existing cells. http://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm
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In 1864 Louis Pasteur was a French scientist that worked with yeast cells. He demonstrated that microorganisms were not able to rise from completely nonliving matter. http://www.xtimeline.com/evt/view.aspx?id=394327
