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Hooke
Hooke was the first person to officially discover the smallest unit of life: cells, although he did not know the significance of these cells or any of the smaller parts inside of them. Hooke's discovery of cells was made by observing what he called "honeycomb-like" structures in a cork under a compound microscope. -
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Because Hooke was the first person to really discover anything about cells, there was no previous model of the cell before him;however, he closely observed the makeup of a cork, in which he discovered even smaller particles in the cork. So, in contrary to past belief that cells developed from spontaneous combustion he discovered that cells are the smallest unit of life. -
Leeuwenhoek
Leeuwenhoek contributed to the discovery of cells because he discovered "protozoa", which are single-celled organisms (bacteria and yeast plants) At the time, he called them "animalcules". He also discovered the circulation of blood corpuscles in capillaries. Leeuwenhoek made his discovery by looking at drops of pond water and blood samples with a microscope he made a lense for that had a magnification of 270x. -
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Leeunwenhoek further proved on Hooke's discovery by stating that cells are made up of not only nonliving material but living material as well. -
Brown
Brown contributed to the cell timeline becuase he discovered the nucleus in plant cells. He made this discovery during his stay in Australia. Brown studied nearly 1700 plant species and while he was scrutinizing the epidermis of a collection of orchids with his microscope, he found that the cells contained an opaque spot which he labeled as the nucleus -
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Brown proved that there were even smaller parts inside of the nucleus so when he discovered this, he proved that cells were in fact not the smallest component of living things. -
Schleiden
Schleiden created the first generalized statement about cells-all plant tissues are composed of cells, and that cells are the basic building blocks of all plants. Schlieden made this discovery by investigating plants microscopically and observing that plants were made up of recongnizable units, or cells. Schleiden didn't necessarily disprove other scientists' statement about the cell, but he build on the broad idea of cells. -
Schwann
Schwann contributed to the cell theory because he concluded that not only plants, but animal tissue is also composed of cells. Schwann made this discovery by drawing upon previous published information. He also concluded that previous statements that said plant and animal cells were composed differently, was incorrect. Schwann further improved the previous theory that only plants were made up of cells by discovering that animals were made up of cells along with plants. -
Virchow
Virchow added the 3rd part to the cell theory which was: all cells develop only from previously existing cells. Also he discovered that sick cells come from previously healthy cells. His discovery was made by observing cells under a microscope. Also he built his claim on the statement made by a previous scientist's (named Robert Remak) theory of cell division. -
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Virchow disproved the previous belief that that things developed through spontaneous generation (that all life arose abruptly from inanimate matter) by discovering that cells reproduce from previously existing cells. He also disproved the past belief that a whole organism gets sick. Instead he observed that certain diseases affect certain sections of cells.
