1. By: Julie Poynter And Abigail Constant

2. In 1595… Janssen invented microscopes. -He discovered the microscope when he was just a teenager. -The microscope was little more than two tubes with a lens on the end of each tube. It focused by twisting the tubes. This microscope magnified items by between three and nine times. -Zacharias Janssen was born in 1580

3. In 1665… He compared Honey Combs to Cells by using his Primitive Compelled microscope. He published his findings in his famous work, Micrographia. He discovered important inventions but he never did follow through and experiment with them. (Born: 1635 – Died: 1703)

4. He used his own single lens monocular microscopes and was the first person to observe bacteria and protozoa. He is known of making five-hundred microscopes. He described cells in a drop of pond water using a microscope. He is a Dutch businessman. In 1670…

5. 1837… Schwann remembered seeing similar structures in the cells of the notochord and instantly realized the importance of connecting the two phenomena and soon appeared in his famous Microscopic Investigations on the Accordance in the Structure and Growth of Plants and Animals. Theodor Schwann declared that "All living things are composed of cells and cell products” He thought the same thing as Schleiden. That all plan tissue are composed of cells.

6. He concluded that all plan tissue are composed of cells. He also included that an embryonic plant arose from a single cell. He declared that the cell is the basic building block of all plant matter. In 1838…

7. In 1839-1843… From a farming family of German and Polish Slavonic heritage, Virchow studied medicine and chemistry in Berlin at the Prussian Military Academy 1839-1843 on a scholarship of dinner. Virchow's most widely known scientific contribution is his cell theory, which built on the work of Theodor Schwann. He is cited as the first to recognize leukemia cells.

8. In 1854… Louis was named Dean of the new Faculty of Sciences in Lille. He exposed boiled broths to air in vessels that contained a filter to prevent all particles from passing through to the growth medium, and even in vessels with no filter at all, with air being admitted via a long tortuous tube that would not allow dust particles to pass.

9. Jansenn-1595 Hooke-1665 Leeuwenhoek- 1670 Schwann-1837 Schleiden-1838 Virchow-1839- 1843 Pasteur-1854

10. http://www.smithlifescience.com/celltheory.htmlhttp://www.smithlifescience.com/celltheory.html http://en.wikipedia.org/wiki/Robert_Hookehttp://en.wikipedia.org/wiki/Robert_Hooke http://en.wikipedia.org/wiki/Rudolf_Virchowhttp://en.wikipedia.org/wiki/Rudolf_Virchow