| Year | Who | What |
| 1530 | Janssen Bros | manufacture microscopes |
| 1665 | Hooke | 'discovers cells'
invents microtome |
| 1679 | Leeuwenhoek | discovers protozoa, bacteria |
| 1835 | Dujardin | contents of cell is the stuff of life |
| 1838 | Schleiden | all plants are made of cells |
| 1838 | Schwann | all animals are made of cells all living beasties made of cells |
| 1846 | von Mohl | introduced term 'protoplasm' |
| 1850 | . | discovery of chromosomes |
| 1855 | Virchow | cell theory: a. all living beasties made of cells b. cell is simplest unit of life c. all cells arise from pre-existing cells |
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