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Living organisms arise
Timeline_small_squareThe Cell Theory Timeline
Aristotle a Greek philosopher classified all living matter into two categories. Those categories are plants and animals. He thought that living organisms can arise from non-living matter. -
First Compound Microscope Created
[Imaging Technology and the Cell Research Project By: Micheal and Will](<a href='http://www.history-of-the-microscope.org/hans-and-zacharias-jansen-microscope-history.php' )
Hans Jansen and his father Zacharias Jansen invented the first compound microscope. This device was used to view cells. -
Spontaneous Generation
JanBaptistavanHelmont
Jan Baptistavan Helmont believed in Spontaneous Generation. “Mixing a dirty shirt with several wheat grains would produce adult mice after 21 days” -
Naming Cells
Cell Theory and Discovery of the Microscope Timeline
Robert Hooke looked at a piece of cork under a microscope and he found cells. This inspired many scientists. Hooke's discovery is one of the biggest contribution to the cell theory because without Hooke cells may not have been discovered in a very long time. -
Scientists begin to doubt the theory of Spontaneous Generation
Francesco Redit.
Discovers that maggots do not appear in meat if
flies cannot land on it. This had a major contribution to the cell theory because it is considered to be one of the major rules of the cell theory. All cells are produced from pre-existing cells. -
Bacteria is found
The history of cell theoryAnton Van Leeuwenhoek made his own simple, tiny microscope. He discovered bacteria from dental. He didn't call it bacteria though, he called it "Animalcules" because they looked like tiny animals. Leeuwenhoek failed to observe their division. This contributed to the cell theory by discovering organisms with one cell. -
Living things are made of cells
LorenzOkenLorenz Oken found out that all living things are made from cells and are made up of cells. In order for a cell to reproduce it needs to create identical cells to the ones it has so it can function correctly. -
The Nucleus is observed
The Britannica Guide to Theories and IdeasRobert Brown, Scottish Botanist recognized the Nuclei in plant and animal cells. The first Nucleus was observed as a constant component of plant cells. -
Plant Cells
Biological expeditions
Matthias Schleiden was a German Botanist, he was interested in plant anatomy. Matthias discovered that all plants are made of cells. He said "the lower plants all consist of one cell, while the higher ones are composed of (many) individual cells." -
All plants and animals are made of cells.
A Brief History of ScienceTheodor Schwann, German Physiologist was friends with Matthias Schleiden. Schwann also modifies and expands Schleiden’s work to say that “Cells are organisms, and entire animals and plants are collectives of these organisms.” This was a major advancement in the cell theory. It renewed the interest that scientists had for cells and their process. -
New cells found
Discovery of Cells and the Development of Cell Theory
Albrecht von Roelliker found out that sperm cells and egg cells are also classified as cells. -
Disproving spontaneous generation
The Cell Theory Timeline
Louis Pasteur contributed to the cell theory by disproving spontaneous generation. By doing an experiment that showed how cells would grow in broth if air was exposed, he found out that cells can only form from pre-existing cells. -
Cellular Pathology
QuizletRudolf Virchow developed cellular pathology. This is a study and diagnosis diseases on the cellular level. This gave a new direction to the study of pathology and resulted in advances in medicine.
