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People didn’t know the microscopic world existed until Robert Hooke created the first microscope in 1665. Robert Hooke then studied fossilized wood and found ancient cells. He discovered that fossils had once been living creatures that once existed and don’t anymore.

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He put the foundation of plant anatomy and also discovered blood cells. On top of that he found microscopic nematodes which are like little worms. He did this by using a microscope that he himself invented in 1668. It was called the Microscope of Anton Van Leeuwenhoek. He discovered bacteria.

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Matthias Schleiden was a German botnaist who was actually the co-founder of cell theory.  He studied microscopic plant structure. In his studies he observed that the different parts of the plant’s organism are comprised of cells or derivivatoves of cells.  Research done in the 1830’s

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The botanist (botany is the study of plants) Matthias Jakob Schleiden was born in Hamburg, Germany on April 5th 1804. Schleiden studied law at Heidelberg and practiced as a legal advocate in Hamburg, Germany until 1831. Having had little success in this career, he began studying botany and medicine at Gottingen and Berlin, and in 1839 graduated from Jena, where he was appointed extraordinary professor of botany from 1839-1862. In 1863, Schleiden was called to Dorpat, Estonia, but resigned the following year and returned to Germany, where he lived as a private teacher.

As a professor at Jena and Dorpat, Schleiden began investigating of the nature of plants, working under Johannes Müller. Unlike his contemporaries who simply classified plants according to their physical characteristics, Schleiden studied them with a microscope. As a result, in the year 1838, Schleiden was the first person to recognize the importance of cells in plants, first discovered by Robert Hooke in 1655, and wondered if the nucleus had something to do with development. Schleiden observed that all plants seemed to be composed of cells, and he proposed that these cells were the most basic unit of life in the plants. He proposed that plant growth took place by the generation of new cells, which, he argued, would propagate or 'crystallize' from buds on the nucleus of old cells. Although later work would show his proposal regarding the budding of the cell nucleus was not completely correct, his theories that the cell was the common structural unit to all plants, and that growth occurred by the addition of new cells, attracted significant attention. A year after Schleiden published his cellular theory of plants in Beiträge zur Phytogenesis ( Contributions of Phytogenesis) in 1838, his friend and collaborator Theodor Schwann made similar observations in animals. Together, Schleiden and Schwann unified botany and zoology under a common theory that the cell is the basic structural unit of living organisms, both animal and plant. As a result, the two are considered the founders of modern cell theory.

Schleiden wrote a number of books and papers over the course of his life including Introduction to Scientific Botany (1842-1843), Manual of Botany Doctor-Pharmaceutics (1852-1857) and T he Plants and their Life (1864). On June 23, 1881, Matthias Schleiden died at Frankfort-on-Main.

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The botanist (botany is the study of plants) Matthias Jakob Schleiden was born in Hamburg, Germany on April 5th 1804. Schleiden studied law at Heidelberg and practiced as a legal advocate in Hamburg, Germany until 1831.

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Theodor Shchwann’s story is similar to Schleiden’s . In 1838 Schwann learned all about Schleiden’s research and started continuing it. He also transferred the research over to animals where he then was able to confirm that cells were real, and also confirmed that human and animal tissues all start from a cell.

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Was originally a medical doctor but when he starting observing cells, that changed. When he looked through a microscope and saw that cells were actually dividing he came up eight he ideology that all cells came from pre-exsiting cells. Research done in the 1850’s

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These guys are known for inventing the compound optical microscope. They made it in the 1950’s, this was a huge deal. It was a large contribution to the Cell Theory, because it made it easier and more practical to observe cells. They also declared that the cell was basically the building block of all plant life.