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Hans and Zacharias Janssen contributed
Hans and Zacharias Janssen were known for inventing the compound optical microscope. This contributed to the cell theory by making it easier and more practical to observe cells. Hans and Zacharias Janssen Cell Theory was first discovered after they developed the microscope. -
Robert Hooke contributed
The cell was first discovered by Robert Hooke in 1665, which can be found to be described in his book Micrographia. In this book, he gave 60 'observations' in detail of various objects under a coarse, compound microscope. One observation was from very thin slices of bottle cork. -
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Anton Van Leeuwenhoek contributed
Anton van Leeuwenhoek is another scientist who saw these cells soon after Hooke did. He made use of a microscope containing improved lenses that could magnify objects almost 300-fold, or 270x. ... Leeuwenhoek named these “animalcules,” which included protozoa and other unicellular organisms, like bacteria. -
Theodor Schwann contributed
Schwann demonstrated the same fact for animal tissues, and in 1839 concluded that all tissues are made up of cells: this laid the foundations for the cell theory. Schwann also worked on fermentation and discovered the enzyme pepsin. ... In 1838 Matthias Schleiden had stated that plant tissues were composed of cells. -
matthias schleiden contributed
Schleiden preferred to study plant structure under the microscope. As a professor of botany at the University of Jena, he wrote Contributions to our Knowledge of Phytogenesis (1838), in which he stated that all plants are composed of cells. -
Rudolf Virchow
Virchow is credited with several very important discoveries. His most widely known scientific contribution is his cell theory, which built on the work of Theodor Schwann. He was one of the first to accept the work of Robert Remak, who showed the origins of cells was the division of pre-existing cells.
