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first microscope
Zacharias Jansen, is usually given Credit for the first microscope, Holland,around the year 1595. -
plants grow from drinking water
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. -
cork cells observed
Robert Hooke used a microscope to observe cork cells, sketches of which appeared in his 1665 publication "Micrographia." -
simple microscope
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, -
new system of animal classification
11 Sep 1802 Lorenz Oken came up with a new system of animal classification that demonstrated the path of evolution -
atomic theory of matter
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 -
part of cell theory
1838 Matthias J. Schleiden all living things are made of cells -
plants and animals are made of cells
In 1839 Theodor Schwann published a monograph that declared all animals and plants are made from one single fundamental unit -
development of cell theory
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. -
discovery of two types of crystals
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 -
extended work of cell theory
in 1858, Rudolf Virchow extended the work of Schleiden and Schwann by proposing that all living cells must rise from pre-existing cells. -
dissection of organisms
aristtle is known fort he dissection of organisms in 384 Aristotle considered the investigation of living things especially animals,
