All things are composed of minute, indestructible, invisible particles of pure matter.
Reported that glass globules filled with water aided in seeing those things difficult to see with the eye.
Investigated magnification by means of curved surfaces.
Stressed the importance of using lenses for the study of small objects.
Combined the two convex lenses within a tube, thus constructing the forerunner of the compound microscope.
Described microscopic structure of familiar substances including the cellular structure of cork.
Disproved the phenomenon of spontaneous generation.
Improved the polishing of lenses of short focal length to improve magnification and discovered bacteria.
Proposed that all organs in animal embryos were made of globules which could be seen under a microscope.
Described the nucleolus after finding it in the slime from an eel's skin.
Declared that cellular tissue is the general matrix of all organization.
Stated that all organic tissues are actually globular cells of exceeding smallness, united by simple adhesive forces.
Reported his observation of cell division.
Stated that each cell forms an independent, isolated whole it nourishes and builds itself up.
Publishes his observations of reporting the discovery and widespread occurrence of nuclei in cells.
Discovered that plant parts are made of cells and that animal parts are made of cells. Also proposed the idea of Cell Theory.
Carefully described details of mitosis in plants.
Stated that all living cells come only from other living cells.
Publishes his investigation of plant hybrids.
Observed and described chromosomes during cell division.