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In 1595 Hans and Zacharias Janssen built the first microscope.

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Used a microscope to examine a thin slice of cork (dead wood from a tree), and was the first to view "cells" he named then cells because they looked like the little rooms monks lived in.

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Anton Van Leewenhoek's compound microscope 

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Anton Van Leewenhoek's compound microscope 

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In 1673 Anton Van Leeuwenhoek invented the first compound microscope.

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Anton Van Leeuwenhoek in 1673 recorded the first observation of cells. He called then "animalcules" he derived his observations from taking his teeth scrapings and pond water.

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In 1838 Matthias Schleiden a German Botanists observed the differences in tissue structure. Concluded that all plants were composed of cells. A cofounder of The Cell Theory

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In 1839 Theodore Schwann a German zoologist, concluded that animals were also made of cells, was the first to publish that statement and idea that all living things are made of cells and cell products. A cofounder of The Cell Theory

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Schwann’s conclusions Original Cell Theory  1. the cell is the unit of structure, physiology, and organization in living things. 2. The cell retains a dual existence as a distinct entity and a building block in the construction of organisms. 3. Cells form by free-cell formation, similar to the form of crystals (spontaneous generation)

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In 1855 Rudolph Virchow, a German botanists- observed plant cells dividing, concluded that all cells come from pre-existing cells via cell division. A cofounder of The Cell Theory.

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1. What theory did these scientists provide evidence for? The Cell Theory
2. What instrument was necessary before the cell theory could be developed? The microscope
3. Which 3 scientists directly contributed evidence for the cell theory? Matthias Schleiden, Theodore Schwann, and Rudolph Virchow
4. How did the earlier scientists and their contributions directly affect the discoveries of later scientists? For example what had to come first? The microscope had to be invented for these scientists to observe and record their findings. Without the microscope you cannot see these microscopic things.

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6.What are the six tenets of the modern Cell Theory?
Modern Tenets of the Cell Theory
1. All known living things are made up of cells
2. The cell is the structural and functional unit of all living things
3. All cells come from pre-existing cells by division mitosis /meiosis  (spontaneous generation does not occur)
4. Cells contains hereditary information which is passed from cell to cell during cell division
5. All cells are basically the same in chemical composition CHO (carbon, hydrogen, oxygen)
6. All energy flow (metabolism and biochemistry) of life occurs within cells