The study of histology dates from the year 1665, when plant cell were discoverd for the time.                      It was robert hooke, anEnglishmen,who first studied the internal structure of a thin slice of  bottle cork with the help of a micrope                  improved by himself. He discovered for the  first time a honey-comb-like structure in it, and to each individual cavity of such a                      structure he applied the term cell. It was then only the cell-wall that was noticed, this being the prominent part of the cell other-                     prominent workers of that time, who studied plant tissues under the microscope, were Leeuwenhoek, Grew and Malpghi. Jeans,                    a spectacle-maker of Middleburg in Holland, first invented  the compound microscope in 1590. Leewenhoek, a cloth merchant                        of Delft in Holland, at the age of 21 in the year 1653 developed a mania for grinding lenses. He pursued this work with zeal and                      assiduity, and with in 20 years (1653-1673) accomplished marvellous fitness, accuracy and perfection in this lenses, He gave a                       demonstration of his microscope before the royal society in 1667. He was the first to discover  bacteria, protozoa and other minute                forms of life -the wretched beasties, as he called them-under his own microscope. Grew, an English physician and botanist, published            his first paper on plant tissues in 1671. Malpighi, an Italian physician, studied the various tissues of vascular plants, and published               his first paper in 1675. In 1838-39 schleiden. a German botanist, and schwann, a German zoologist, proved definitely that both plants           and animals are  cellular in character, and founded the cell theory.