Cell theory timeline by Peyton Alspach

Timeline created by Peyton Alspach
  • -330 BCE


    384 BC
    - Did many experiments
    - First to theorize that each germ came from another
    - Each gene has a "definate parent and a similar offspring"
  • Period:
    -200 BCE


  • Zacharias Jansen

    Zacharias Jansen
    - Invented the first compound microscope
    - Allowed scientists to cite and observe cells
    - Proved all living things are made of cells
  • Jan Baptist van Helmont

    Jan Baptist van Helmont
    -Made the theory of spontaneous generation
    -living things just randomly appeared like magic.
  • Robert Hooke

    Robert Hooke
    - First person to observe cells
    - Created the term cell while observing a piece of cork
    - Cells came from the term cell which is a monk's living quarters
    - Led to greater understanding of cells and life
    - Proved all living things are made of cells
    - Cork is a living thing
  • Anton van Leeuwenhoek

    Anton van Leeuwenhoek
    - Invented a lens for the microscope to magnify 270%
    - First to see spermotoza and protozoa
    - His findings supported cell theory as a whole
  • Lorenz Oken

    Lorenz Oken
    - Proved all living things originate and consist of cells
    - Developed a new system of animal classification based on evolution
    - Believed in both the ideas that all living organisms have cells and cells are formed by pre-existing cells
  • Robert Brown

    Robert Brown
    - Observed plant cells
    - Discovered/named the cell nucleus
    - Stressed its importence in reproduction and recognized its signifigance as an essential organelle
    - Proved all living things are composed of cells
  • Matthias Schleiden

    Matthias Schleiden
    - Obseverd plants on a microscopic level
    - All plant tissues are composed of cells
    - Embryonic plants arise from single cells
    - Cells are the building blocks of plant matter
    - All plants grew throught the production of new cells
    - Believed that new cells in plants were formed form the nucleus of old cell
  • Theodor Schwann

    Theodor Schwann
    - Reached same conclusion as Schleiden but in animals
    - Ended controversy that plants and animals were fundamentally different
    - Examined the cellular structure in animal cartilage and determined that cells are the basic unit of life
  • Albrecht von Roelliker

    Albrecht von Roelliker

    -Discovered through the help of powerful microscopes that the sperm and egg were composed of cells
    -humans are formed of cells from beginning to end.
  • Rudolf Virchow

    Rudolf Virchow
    - Every cell comes from a pre-existing cell
    - First to demonstrate that the cell theory applies to both normal and diseased cells
    - Added to the cell theory and strengthened the theory that cells exist from pre-existing cells
  • Louis Pasteur

    Louis Pasteur
    - Conducted experiments to disprove spontaneous generation.
    - Used S shaped beaker to trap microorganisms and prevent them from entering broth
    - Suggested the germ theory which states that microorganisms cause infectious diseases
    - Proved the cell theory by showing that spontaneous generation does not exist and all cells are formed by pre-existing cells