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Aristotle was known for his experimentaions and formed some animal classifications that we still use today.
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Jan Baptist von Helmont did an experiment in which he shows that the substance of a plant derives from water and air, the first description of photosynthesis.
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Zacharias Jansen invented the first compound microscope.
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Robert Hooke observed cork cells and inspired Leeuwenhoek.
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Antoni van Leeuwenhoek reported that he had observed "little animals."
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Oken proposes that “all organic beings originate from and consist of vesicles or cells.
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Robert Brown established that tiny particles of inorganic materials such as carbon and metals display Brownian motion.
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Matthias Schleiden recognizes that all parts of plants are composed of cells.
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Theodor Schwann published "Microscopic Investigation on the Accordance in the Structure and Growth of Plants and Animals," which included the first cell theory statement: All living things are made up of cells.
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Albrecht von Roelliker realized that sperm cells and egg cells are also cells.
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Rudolf Virchow extended their work by proposing that all living cells came from pre-existing cells.
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Louis Pasteur proved that flasks of broth and water did not spoil when organisms were prevented from entering them.
