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The Cell Theory Timeline
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The Cell Theory Timeline

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  • 1. The Cell Theory – a timeline
    Late 1500’s: -first lenses used in Europe
    -used to determine cloth quality (weave and precision)
    -combos of lenses gave better view
    -Hans Janssen and son Zacharias invented first compound microscope in 1590
  • 2. Robert Hooke ( 1665)
    • Used light microscope to look at thin slices of plant tissues -- cork
    • 3. Looked empty, like monk’s chamber
    • 4. Called tiny chambers “cells”
  • 1673
    • Leeuwenhoek
    • 5. first to view pond water organisms
    • 6. First to see living microscopic orgs
    • 7. Made careful sketches
  • Matthias Schleiden 1838
    • German Botanist (plants)
    • 8. All plants looked at were made of cells, so concluded:
    “All plants are made of cells.”
  • 9. Theodore Schwann -- 1839
    • German scientist who studied animals -- zoologist
    • 10. Saw that all animals he studied were cellular so concluded:
    “All animals are made of cells.”
  • 11. Rudolf Virchow -- 1855
    • German physician who studied cell reproduction
    • 12. “Where a cell exists, there must have been a preexisting cell…..”
  • The Cell Theory
    • All living things are composed of cells
    • 13. Cells are the basic units of structure and function in living things
    • 14. New cells are produced from existing cells

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