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Janson invented the first basic microscope. Without this invention, people would have never seen cells.
LINK- http://www.cpschools.com/Schools/OSM/theory.htm
PICTURE LINK- https://www.google.com/search?q=JANSSEN'S+FIRST+MICROSCOPE&sa=X&rls=com.microsoft:en-US:IE-Address&tbm=isch&tbo=u&source=univ&ei=qAN_UsiSLMKfyQGPl4HoDQ&ved=0CEEQsAQ&biw=1920&bih=879#facrc=_&imgdii=_&imgrc=uj8SydBX_gyHrM%3A%3Blr-3dCRHzN7IUM%3Bhttp%253A%252F%252Fwww.cerebromente.org.br%252Fn17%252Fhistory%252Fjansen-micro.JPG%3 -
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Aristotle initially observed plants and animals around the year 340 B.C. He finally came to the conclusion that the sperm cell or any cell is just an undevlopted version of the mature specimen.
LINK- http://www.timetoast.com/timelines/cell-theory-timeline--20
PICTURE LINK- http://www.google.com/imgres?imgurl=http://www.thecrossedcow.com/wp-content/images/2013/10/Aristotle.jpg&imgrefurl=http://www.thecrossedcow.com/2013/10/03/would-aristotle-drink-guinness/&h=400&w=308&sz=134&tbnid=0epqkqAD9DvuQM -
Jan Baptist Helmont did research pretaining to the idea that there was some other element in the air. He came to the conclusion that there was a way to create a different element by heating and he named it "gas" or the latin word for "chaos".
LINK- http://www.cartage.org.lb/en/themes/Biographies/MainBiographies/H/Helmont/1.html
PICTURE LINK- http://www.mediahex.com/Van_Helmont -
Used a microscope to observe a cork or at a cellular level and found small indents naming them "cells".
LINK- http://www.cpschools.com/Schools/OSM/theory.htm
PICTURE LINK-http://askabiologist.asu.edu/content/robert-hooke -
Edited microscopes to increase magnification and enabled himself to observe the first live cell and named it "animacules".
LINK- http://www.cpschools.com/Schools/OSM/theory.htm
PICTURE LINK- https://www.google.com/search?q=animalcules&rls=com.microsoft:en-US:IE-SearchBox&source=lnms&tbm=isch&sa=X&ei=MwZ_UuOPK8K0yAGx_IHgCw&ved=0CAkQ_AUoAQ&biw=1920&bih=879#facrc=_&imgdii=_&imgrc=t3CSyLVtrYU8UM%3A%3BRuxwlbUfJJem8M%3Bhttp%253A%252F%252Fvintageprintable.com%252Fwordpress%252Fwp-content%252Fuploads%2 -
When reseaeching about the cell life Oken came to the conclusion that there are fundemental parts of life, which he later called "infusoria". Even though he was proved wrong later, he did contribute to the development of cell theory at the time.
LINK- http://www.bookrags.com/research/lorenz-oken-scit-0512/
PICTURE LINK- http://upload.wikimedia.org/wikipedia/commons/8/8e/Lorenz_Oken_Portrait.jpg -
Contributions to cell theory were made by Robert Brown when he determined and observed the cell. He made observations on the cell's cytoplasm and the nucleus by using a microscope. Brown also contributed to ideas of plant pollination and fertilization.
LINK- http://www.ask.com/question/robert-brown-cell-theory
PICTURE LINK- http://www.nhm.ac.uk/nature-online/art-nature-imaging/collections/art-themes/caught_in_oils/brown_main.htm -
Researched and discovered that plants were made up of cells.
LINK- http://www.cpschools.com/Schools/OSM/theory.htm
PICTURE LINK- http://portrait.kaar.at/Stahlstiche%204/image21.html -
Theodore Shwann was a german scientist who discovered that animals were made up of cells, just like Matthias Schleiden.
LINK-http://www.cpschools.com/Schools/OSM/theory.htm
PICTURE LINK-http://www.science-of-aging.com/timelines/theodor-schwann-all-life-composed-of-cells.php -
In cell theory at this point, scientists believed that matter and cells just appeared but Albrecht proved that cells came from other cells by using a crude microscope.
LINK- http://www.answers.com/topic/albert-von-kolliker
PICTURE LINK- http://en.wikipedia.org/wiki/Albert_von_Kölliker -
In 1885 Rudolph VIchrow made the connection that all living things are made up of other living things.
LINK- http://www.cpschools.com/Schools/OSM/theory.htm
PICTURE LINK- http://www.biography.com/people/rudolf-virchow-9519219 -
In 1850 Pasteur proves spontaneous generation wrong and performed expiriments showing that cells only thrive with oxygen available.
LINK- http://www.bitesizebio.com/articles/history-of-cell-biology/
PICTURE LINK- http://www.biography.com/people/louis-pasteur-9434402
