Here are the key events listed in chronological order with their corresponding year.
1. Hooke coins the word cell after viewing cork cells with primitive microscope. (1665)
2. van Leeuwenhoek discovers bacteria with his improved microscope. (1676)
3. Brown recognizes and names the cell nucleus. (1831)
4. Schleiden & Schwann propose cell theory. (1839)
5. Virchow describes cell division; proposes that all cells arise from other cells. (1855)
6. Pasteur disproves spontaneous generation and proposes germ theory. (1861)