Contributions to Cell theory

Events

Hans and Zachaaris Janssen

1590

Zacharias Janssen created the first compound microscope with helped from his father Hans.

Robert Hooke

1663 - 1665

Robert Hooke then discovered empty, dead cork cells in tree bark.

Anton Van Leeuwenhoek

1674 - 1683

Leeuwenhoek was the first to record and observe muscle fibres, bacteria, spermatozoa and blood flow in capillaries (small blood vessels).

Theodor Schwann

1837 - 1839

Proposed cell theory that, , "All living things are composed of cells and cell products".

Matthias Schleiden

1839

Matthias Schleiden stated that different part of the plant organisms are composed of cells.

Albrecht von Roelliker

1840

Discovered that sperm and eggs are also cells.

Carl Heinrich Braun

1845

Carl Heinrich Braun calls cells the basic unit of life.

Rudolph Virchow

1855

Rudolph Virchow stated that all cells come from pre- existing cells. Then he also stated that not all plant cells are not made up of cells. Which eventually lead to the creation of cell theory.