Scientist's Timeline

Main

Zacharias Janssen creates compound microscope

1590

Robert Hooke discovers pores or cells

1665

Anton Van Leeuwenhoek built a simple microscope

1674

he also carefully observed organism, bacteria, and blood cells

Matthias Schleiden concludes all plant tissues are made of cells

1838

Theodore Schwann created the cell theory: the cell is the basic unit of life

1839

Rudolph Virchow stated that all cells develop from existing cells

1855