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Preformation is observed
Aristotle observed preformation and epigenisis when theorizing how animals and plants developed. Preformation is the theory that a sperm or other cell is a miniature version of the animal and will grow when properly stimulated. -
First compound microscope is created
Zacharias Janssen creates the first compund microscope. It allows us to see cells -
Discrete gases are recognized
Jon Baptist van Helmont recognized descrete gases. He identified carbon dioxide. -
Cells are recognized
Robert Hooke looked through a microscope at a cork & noticed cells. He was the first person to use the word cell to describe microscopic structures. -
Theory of spontanious generation is rejected
Francesco Redi performed an experiment to see if rotting meat changed into flies. He discovered that only flies to could make more flies, thus disproving the theory of spontaneous generation. -
Microscope used to view different types of cells
Anton Van Leeuwenhoek used a microscope to view pond organisms, bacteria, and blood cells. -
Theory that a life force was present in all inorganic matter is developed
John Needham discovered that soup that had been exposed to the air contained micro organisms. He theorized that a life force was present in all inorganic matter including air and oxygen that could cause spontaneous generation. -
Micro organisms get into soup from the air
Lazzaro Spallanzani discovered that soup that was kept sealed did not contain the micro organisms that appeared in soup open to the air. He determined that micro organisms get into the soup from the air. -
Living things come from and are made of cells
"All living organisms originate from and consist of cells" was a quote by Lorenz Oken. -
Nucleus of a cell is discovered
Robert Brown discovers the nucleus of the cell. He stresses its importance in fertilization. -
Cell theory is developed
Matthias Schleiden and Theodor Schwann create cell theory. The theory states that all living things are made up of one or more cells. Schwann conducts experiments to help disprove spontaneous generation once and for all. -
Sperm and eggs are also cells
Albrecht von Roelliker discoveres that sperm and eggs are also cells -
Cellula e cellula is writen and published
Rudolf Virchow writes and publishes his aphorismomnis "cellula e cellula". This means every cell stems from another cell. He theorized that all forms of disease come from changes in normal cells -
Gregor Mendel experiments with pea plants
Mendel is later known as the father of genetics for his work in tracking genetic information in peas. -
Virchow endorses the role cell division plays in pathology
Rudolf Virchow heartily endorses cell division and the role it plays in pathology -
The Origin of Species is published
Charles Darwin wrote and published The Origin of Species which explains heredity and variations in different species. -
Germ theory of disease is proven
Pasteur was a French chemist and biologist who proved the germ theory of disease and invented the process of pasteurisation. -
Walter Feming uses dyes to stain cells
Upon examination of these cells, he finds rods that he calls chromosomes.
