Development of the Cell Theory


Creation of the First Microscope


Janssen created the first microscope. It had a 3x magnification but when extended, could reach up to 10x ("History of the Microscope", 2010)

Discovery of Cells


Robert Hooke, studying thin slices of cork, discovered box-like structures he called "cells". They were called cells because the structure reminded him of the cells of a monastery("History of the Microscope", 2010).

Discovery of Unicellular Organisms


Anton van Leeuwenhoek created a powerful microscope, and with it, discovered the existence of unicellular organisms.

Plants are made of cells


Matthias Schleiden states that all plants are made of cells.

Animals are made of cells


Theodore Schwann states that all animals are made of cells.

Cells come from cells


Rudolf Virchow states that all cells come from preexisting cells.

Revolution of Optical Instruments


Carl Zeiss, Ernst Abbe, and Otto Schott revolutionized the manufacture of optical instruments and invented the modern compound microscope.

Invention of the Electron Microscope


Max Knoll and Ernst Ruska invented the electron microscope. With it, they were able to see even atoms.