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Hooke
Robert noticed a honeycomb-like structure on a cork using a compound microscope, and used the term "cell" to describe his observations. Hooke's findings prompted the idea of structure inside substances. -
Leeuwenhoek
Observed water and other substances through a microscope with custom lenses. Later Leeuwenhoek wrote a letter to the Royal Society about his discoveries which consisted the first bacteria and protozoa ever discovered. This added onto Hooke's theory by telling us cells are more than just compartments but there could also be living cells. -
Brown
Robert Brown contributed to the cell theory by observing constant radical motion of molecules inside cells under a microscope which was later called "Brownian Method". Brown was also the first person to give the nucleus it's name (Franz Bauer was the first to discover the nucleus but isn't often credited for it because he never gave it the name). Robert contributed and built upon to the previous cell theory by recognizing that cells have multiple moving parts. -
Schleiden
Schleiden discovered that plants were made from plant cells by microscope. The discovery he made built upon Brown's discoveries because it shows that plants have rapidly moving molecules inside of its cells. Schleiden also created the first cell theory that stated cells are the building blocks of all plant tissue. -
Schwann
Schwann discovered that plant and animal tissue contain cells, meaning plants and animals are somewhat similar in structure. Schwann contributed to the theory by compiling other scientists findings into one theory: Cells are organisms and all organisms consist of one or more cells. And the cell is the basic unit of structure for all organisms -
Virchow
Virchow made additions to the 2nd version of the cell theory, developed my Schwann, which states that healthy cells come from other healthy cells, and that those healthy cells can die. He contributed to the cell theory by putting his predecessors' ideas together along with his to create a theory based on his and others' discoveries. -
References
• "Cell Theory Timeline." Cell Theory Timeline. N.p., n.d. Web. 06 Oct. 2016.
http://www.softschools.com/timelines/cell_theory_timeline/96/ • "Robert Brown." Famous Scientists. N.p., n.d. Web. 02 Oct. 2016.
http://www.famousscientists.org/robert-brown/ • Robinson, Richard. "History of Biology: Cell Theory and Cell Structure." Biology Encyclopedia. N.p., n.d. Web. 02 Oct. 2016.
http://www.biologyreference.com/Gr-Hi/History-of-Biology-Cell-Theory-and-Cell-Structure.html