The Development of Cell Theory

Spontaneous Generation

322

Aristotle said that living things come from non-living things.

The Invention of the Microscope

Nov 7, 1595

Hans and Zacharias Janssen created the first compound microscope.

Photosynthesis Discovered

Nov 10, 1664

Jan Baptista van Helmont discovered the principles of photosynthesis.

Cellular Composition

Nov 7, 1665

Robert Hooke discovered the cellular composition of cork and introduced the word cell to science.

Increased Magnification

Nov 7, 1674

Anton van Leeuwenhoek improved magnification of microscopes by the polishing lenses.

Animalcules Discovered

Nov 7, 1676

Anton van Leeuwenhoek discovers animalcules.

Bacteria Discovered

Nov 7, 1683

Anton van Leeuwenhoek discovered bacteria from a sample of saliva from his mouth.

Consistant Cells

Nov 10, 1805

Lorenz Oken said that all livings things originate from consistant cells.

Nucleus Discovered

Nov 10, 1831

Robert Brown discovered and named the nulceus of cells.

Animal Cells Discovered

Nov 10, 1839

Theodor Schwann discovered that animals were made up of cells.

Sperm and Egg Cells

Nov 10, 1840

Albrecht van Roelliker realizes that sperm and egg cells are cells.

Living Things Come From Living Things

Nov 10, 1855

Rudolph Virchow stated that all living things come from other living things.

Plant Cells Discovered

Nov 10, 1883

Matthias Schleiden discovered that plants were made up of cells.