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Robert Hooke, an English scientist, discovered a honeycomb-like structure in a cork slice using a primitive compound microscope. He only saw cell walls as this was dead tissue. He coined the term "cell" for these individual compartments he saw.
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Anton van Leeuwenhoek, a Dutch biologist, looks at pond water with a microscope he made lenses for.
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Anton van Leeuwenhoek made several more discoveries on a microscopic level, eventually publishing a letter to the Royal Society in which he included detailed drawings of what he saw. Among these was the first protozoa and bacteria discovered.
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Robert Brown, an English botanist, discovered the nucleus in plant cells.c
