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400
Aristole
Time- 350 B.C.E.
Aristotle was known for his numerous dissections. He was drawn to animal classification to try and connect the human soul to the human body. This classification classified animals by how complex their inner organs and systems were. -
Zacharias Jansen
In the 1590's a acientists named Zacharias Jansen had invented the first known compound microscope that are still used today. -
Jan Baptists van Helmont
Van Helmont is remembered today largely for his ideas on spontaneous generation, his 5-year tree experiment, and his introduction of the word "gas" (from the Greek word chaos) into the vocabulary of scientists. -
Anton van Leeuwenhoek
Dutch tradesman and scientist. He is commonly known as "the Father of Microbiology", and considered to be the first microbiologist. He is best known for his work on the improvement of Jansen's microcope. As a result he is the first to observe sigle-celled organisms. -
Lorenz Oken
1 Jan 1803 Lorenz Oken belived in the cell theory, but he had his own take on it. He believed that there were tiny units of life called infusoria that make up the human skin, bones, and organs. Oken's very similar, but different at the same time helped spread the cell theory. -
Robert Brown
Robert Brown was a well known Scottish botanist. He discovered the cell nucleus while looking at a plant cell. This was a contribution to the cell theory because it showed that all living things were made of one or more cells. -
Theodor Schwann
Theodor Schwann was a founder of the cell theory. When he was talking to one of his colleagues about plant nuclei he realized that cells must be produced from pre-existing cells and that all living things are produced of cells. -
Matthies Schleilden
Matthias Schleiden was a co-founder of the cell theory. He helped contribute to the cell theory by publishing a book about leaves being composed by cells. -
Albrecht von Roelliker
Albrecht von Roelliker realized that sperm cells and egg cells are also cells -
Louis Pasteur
Louis Pasteur contributed to the cell theory by disproving spontaneous generation. He was the first scientist to prove that cells can only form from pre-existing cells. He did this by creating an experiment that showed cells would only grow in broth if air was exposed. -
Rudolf Virchow
Rudolf Virchow is known for stating that the only source for a cell to be produced is from another cell. To prove this he repeated Redi's experiment. He contributed to the cell theory by publishing a book titled "Every Cell Originates From Another Existing Cell Like It."
