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Zacharias Jansen, is usually given Credit for the first microscope, Holland,around the year 1595.
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In 1634 Jan Baptist Van Helmont studied plants The contempory theory was that plants grew by eating soil. He did an experiment to test this theory. He concluded that the tree grew by drinking water.
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Robert Hooke used a microscope to observe cork cells, sketches of which appeared in his 1665 publication "Micrographia."
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1668, Anton van Leeuwenhoek learned to grind lenses, made simple microscopes, and began observing with them.Anton van Leeuwenhoek, discovered blood cells, spermatozoa, and a lively world of “animalcules, in 1673,
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11 Sep 1802 Lorenz Oken came up with a new system of animal classification that demonstrated the path of evolution
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Robert Brown is best known for describing the agitation of microscopic particles suspended in a liquid or gas,important to the development of the atomic theory of matter, which states that matter is composed of small particles in random motion In 1828, his observations of this motion were published
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1838 Matthias J. Schleiden all living things are made of cells
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In 1839 Theodor Schwann published a monograph that declared all animals and plants are made from one single fundamental unit
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One of Kolliker's most important contributions was the development of cell theory During the 1840s, Kolliker carried out extensive research on the nervous system. his most important accomplishment was documenting the connection between nerve fibers and the cell bodies to which they are attached.
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louis pasteur studied the effect of tartaric acid on polarized light. Under a microscope in 1848, he discovered that there were two types of tartrate crystals which were mirror images of each other
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in 1858, Rudolf Virchow extended the work of Schleiden and Schwann by proposing that all living cells must rise from pre-existing cells.
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aristtle is known fort he dissection of organisms in 384 Aristotle considered the investigation of living things especially animals,
