The Development of Cell Theory By EDarland Period: Jul 1, 1590 to Jul 3, 1855 Development of Cell Theory Jul 3, 1590 Hans and Zacharies produce first compound microscope Jan 2, 1665 Robert Hooke observes cork under micrscope and states looks like "cells" Jan 3, 1680 Anton Van Leeuwenheowk first to observe living cells under microscope Jan 3, 1838 Matthias Schlieden discovers plants are made of cells Jul 3, 1839 Theodor Schwan discovers animals are made of cells Jul 3, 1855 Rudolph Virchow stated all cells come from other cells
