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335
Aristotole founded his own school in Athens
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First microscope invented by Zacharias Janssen
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Jan Baptist van Helmont discovers trees don't eat soil
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Robert Hooke discovered a honeycomb-like structure in a cork slice
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Anton van Leeuwenhoek helps microbioligy
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Lorenz Oken animals into 5 classes
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Robert Brown discovers nucleus of plant cells
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Matthias Schleiden proposes that cells are building blocks of cells
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Theodor Schwann discovered pepsin
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Albrecht von Roelliker discovers that sperm and eggs are also cells
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Louis Pasteur discovered the principles of vaccination
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Rudolf Virchow added 3rd part of cell theory