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300
Experimentation and animal classification
Aristotle was known for his experimentaions and formed some animal classifications that we still use today. -
Nov 9, 1500
Tree plant experiment
Jan Baptist von Helmont did an experiment in which he shows that the substance of a plant derives from water and air, the first description of photosynthesis. -
Microscope
Zacharias Jansen invented the first compound microscope. -
Cork cells
Robert Hooke observed cork cells and inspired Leeuwenhoek. -
"little animals"
Antoni van Leeuwenhoek reported that he had observed "little animals." -
Die Zeugung (The Conviction)
Oken proposes that “all organic beings originate from and consist of vesicles or cells. -
Brownian motion
Robert Brown established that tiny particles of inorganic materials such as carbon and metals display Brownian motion. -
Plant cells
Matthias Schleiden recognizes that all parts of plants are composed of cells. -
First cell theory statement
Theodor Schwann published "Microscopic Investigation on the Accordance in the Structure and Growth of Plants and Animals," which included the first cell theory statement: All living things are made up of cells. -
Sperm and egg cells
Albrecht von Roelliker realized that sperm cells and egg cells are also cells. -
Pre-existing
Rudolf Virchow extended their work by proposing that all living cells came from pre-existing cells. -
Death of Spontaneous Generation
Louis Pasteur proved that flasks of broth and water did not spoil when organisms were prevented from entering them.