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Robert Hooke
Robert Hooke looked at a sliver of cork through a microscope lens and noticed some "pores" or "cells" in it. Hooke was the first person to use the word "cell" to identify microscopic structures when he was describing cork. -
Antonie van Leeuwenhoek
Antony van Leeuwenhoek described observations on lake water, including a description of the green charophyte alga Spirogyra.He also improved the microscope. -
Theodor Schwann
Schwann proposed that all organisms are composed of cells. Together with Matthias Schleiden he formulated the cell theory of life. Schwann also discovered the cells, now known as Schwann cells, that form a sheath surrounding nerve axons and conducted experiments that helped disprove the theory of spontaneous generation. -
Rudolph Ludwig Karl Virchow
Rudolph Virchow’s most widely known contribution was that he found new cells that could be produced only from division of existing cells. Rudolph Virchow suggested that all cells come from pre-existing cells. He stated that all living things come from other living things.He also said that all diseases involve changes in normal cells -
Rene Dutrochet
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Ernest Ruska