1. T IMELINE OF THE D EVELOPMENT OF C ELL T HEORY By: Cindy Chen, Sofia Benares, Mahek Tulsiani, Kristel Jalandoni

2. 1595 Hans and Zacharias Janssen Hans and Zacharias Janssen created the first compound microscope

3. 1665 Robert Hooke Robert Hooke observed cells in a thin slice of cork.

4. 1680 Anton van Leeuwenhoek Anton van Leeuwenhoek observed living cells in scrapings of teeth, rainwater and blood.

5. 1838 Theodor Schwann (biologist) and Matthias Schleiden (physiologist) discover together that both animal cells and plants cells have nuclei.Theodor SchwannMatthias Schleiden

6. 1839 Theodor Schwann Theodor Schwann and Matthias Schleiden formulate cell theory. Matthias Schleiden cell theory.

7. 1839 SchwannSchwann publishes 'Microscopic Investigations on the Accordance in the Structure and Growth of Plants and Animals', outlining cell theory.

8. 1855 Rudolf Virchow Rudolf Virchow stated that all living cells come only from other living cells

9. 1886 August Weismann August Weismann puts together cell theory with evolutionary theory

10. C ELL T HEORY The theory that all living things are made up of one or more cells. http://www.lycos.com/info/matthias-jakob-schleiden.html

11. M ATTHIAS S CHLEIDEN 1814-1881 German botanist Wrote “Contributions to Phytogenesis” Professor of Botani at University of Tartu http://www.lycos.com/info/matthias-jakob-schleiden.html http://www.cbu.edu/~seisen/SelectedEventsBiologicalSciences.htm

12. T HEODOR S CHWANN (1810-1882) German physiologist/zoologist Formed cell theory with Matthias Schleiden Published 'Microscopic Investigations on the Accordance in the Structure and Growth of Plants and Animals‘ http://www.takdangaralin.com/science/scientists/scientist-theodor-schwann/

13. R UDOLF V IRCHOW German pathologist and statesman, one of the most prominent physicians of the 19th century. He pioneered the modern concept of pathological processes by his application of the cell theory to explain the effects of disease in the organs and tissues of the body. Oct. 13, 1821 - Sept. 5, 1902 http://www.britannica.com/EBchecked/topic/629797/Rudolf-Virchow http://www.schools.utah.gov/curr/science/sciber00/7th/cells/sciber/cellhist.htm

14. A UGUST W EISMANN German biologist and one of the founders of the science of genetics, who is best known for his opposition to the doctrine of the inheritance of acquired traits and for his “germ plasm” theory, the forerunner of DNA theory. http://www.britannica.com/EBchecked/topic/639121/August-Friedrich-Leopold-Weismann Jan. 17, 1834 - Nov. 5, 1914

15. H ANS AND Z ACHARIAS J ANSSEN Dutch father and son Lens grinders Created the first compound microscope (with 2 lenses) in 1595 "History of Cell Discoveries." Utah State Office of Education - USOE - Welcome. Web. 16 Aug. 2010..

16. R OBERT H OOKE English In 1665, he observed tiny, hollow, room-like structures in a thin slice of cork which he called ‘cells’ because they reminded him of the cells of a monastery Only saw the outer walls because they were not alive "History of Cell Discoveries." Utah State Office of Education - USOE - Welcome. Web. 16 Aug. 2010.. July 18, 1635 – March 3, 1703

17. A NTON VAN L EEUWENHOEK Amateur scientist; originally a fabric merchant Dutch Observed blood, rainwater and scrapings of teeth through a simple microscope with one lens in 1680 Observed living cells that he called ‘animalcules,’ some of which are now called bacteria "History of Cell Discoveries." Utah State Office of Education - USOE - Welcome. Web. 16 Aug. 2010.. Oct. 24, 1632 - Aug. 26, 1723