HISTORY OF THE DISCOVERY OF CELLS By timella Jun 27, 1665 ROBERT HOOKE Examined a thin slice of cork from an oak tree. He described the cell as "small vacces" Aug 8, 1667 Antoine Van Leeuwenhoek He continued to develop microscope. He observed 500 microscopes. He observed letters and then single-cell organisms. Aug 7, 1824 Henry Durochet He proposedthat all living things are made up f cells. Aug 7, 1831 Robert Brown He discovered nucleus ( a small dense, round body in the body in the cell). Aug 7, 1835 Felix Dujardin He discoverd the internal substance ofthe cell which is sarcode. Aug 7, 1838 Matthias Schleiden He proposed that all plants are composed of cells. Aug 7, 1839 Theodore Schwann He proposed that all animals are made up of cells. Aug 10, 1839 Johannes Purkinje He examined a jelly-like material in the cell and named it protoplasm. Aug 7, 1855 Rudolf Virchow He discoverd the bacteria found inside the intestines (Escheuchia coli). He discovered cell division. He proposed that "cells come from pre-existing cells".