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25 Sep 2017
In 1665, Robert Hooke discovered a honeycomb like structure in his cork slice using a microscope. He noticed the cell walls as this was dead tissue and came formed the word cell.
Anton van Leeuwenhoek made several microscopic discoveries and published a letter to the Royal Society. In his letter he included his findings and this lead to the first discovery of protozoa and bacteria.
Matthias Schleiden proposed that all plant tissues are composed of cells, and that cells are the basic building blocks of all plants.
Theodor Schwann reached the conclusion that not only plants, but animal tissue too are composed of cells. He also came up with the statement that every organism is made up of at least 1 cell.
Rudolf Virchow added the 3rd part to the cell theory stating cells develop only from other existing cells. Virchow was also the first to propose that diseased cells come from healthy cells.
Hans and Zacharias Janssen invented the compound optical microscope. This microscope made it easier and more practical whilst observing cells.
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