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Hooke
Hooke was looking at a thin piece of cork under a microscope when he discovered the cell wall in the cork's tissue. He called the empty little boxes or pores "cells." After this discovery Hooke wrote a book called, Micrographia: or Some Physiological Descriptions of Miniature Bodies Made by Magnifying Glasses" to educate others about this discovery. Before Hooke's findings people thought that things were created from spontaneous germination. -
Leeuwenhoek
Leeuwenhoek is known for contributing to the cell theory when he discovered bacteria under his own improved version of the microscope. When he was looking under the microscope he found animal-like creatures which ended up being bacteria. To prove his discovery, he asked Hooke to confirm his findings. When Hooke did confirm them, Leeuwenhoek's findings was well-accepted. He improved on what Hooke said about cells by elaborating what cells can make. -
Browne
Browne's contribution to the cell theory was his discovery of the nucleus. He discovered the nucleus when he was looking at plants under the microscope. Browne also researched about what is inside of the cell and what the functions of a cell are. People thought that angiosperms and gymnosperms were the same but Browne proved them wrong with the more he learned about cells. Neither Hooke nor Leeuwenhoek mentioned the nucleus. -
Schleiden
Schleiden contributed to the cell theory because he is credited for discovering plant cells. He recognized that all plants are composed of cells. Plant tissues are composed of cells and the embryonic plant was created from one cell. He declared cells to be the basic building block of all plant matter. Schleiden's discovery of the plant added to what the other scientist said before him. He made his discovery by looking at plants through the microscope. -
Schwann
Schwann's contribution to the cell theory is his discovery of animal cells. He said all living things are composed of cells. He established that cells are organisms and all organisms consist of one or more cells. He also said that the cell is the basic unit of life. He agreed with Schleiden that animal tissues are composed of cells, ending speculations that plants and animals were fundamentaly different. -
Schwann continued
Schwann thought that all living and nonliving things are structured similar, even though there are many different types of cells. Previous theories stated animals and plants had different composition because of the extreme differences, which Schwann proved otherwise. -
Virchow
Extending the work of Schwann and Schleiden, Virchow proposed that all living cells must appear from pre-existing cells. He said that all cells result from the division of previously-existing cells. He studided diseases and he said that all diseases attack normal cells and cause them to malfunction. A whole organism does not get sick but each disease affects a certain set of cells, not all of the organism's cells. -
Virchow continued
From studying diseases and learning how cells are affected by diseases, made him realize that all cells are formed from the division of previously-existing cells.
