Zacharias Janssen a Dutch eyeglass maker and the son of a spectacle maker Hans Janssen.
Robert Hooke an English scientist who used the compound microscope to observe a cork or outermost layer of the cork.
Anton Van Leeuwenhoek a Dutchtradesman who became one of the first scientists to refer to living cells when he observed an abundant number of single-celled organisms which he called animalcules (plant & animal).
Robert Brown able to compare diverse kinds of plants specimens under the microscope in 1831.
Theodor Schwann suggested that cells were the basic units of life.
Matthias Jakob Schleiden German botanist who concluded that all plants tissues are composed of cells and an embryonic plant arouse from a single cell.
He also suggested that cells were made by a crystallization process either from other cells or from the outside. However, later discoveries proved him wrong.
Matthias Jakob Shlieden
Rudolf Virchow German pathologist who stated that every new cell arises from pre-existing cells by mitosis.
