Zacharias Janssen, with the help of his father, Hans, invented the first microscope. This allowed other scientists, like Robert Hooke, to investigate cells.
Robert Hooke discovers the cell when he put a thin slice of cork under a microscope, and he saw the dead cell walls. Their structure reminded him of the rooms that monks live in, so he named them "cells."
Living Cells First Seen
Anton Van Leeuwenhoek makes more powerful lenses for a microscope and sees living cells in a pond.
Anton Van Leeuwenhoek makes more discoveries, and publishes a letter to the Royal Society in which he included detailed drawings of the first protozoa and bacteria discovered.
Nucleus First Seen
Robert Brown discovers the nucleus in plant cells.
Basic Building Blocks
Matthias Schleiden proposes that plant tissues are made of cells, and that cells are the basic building blocks of plants.
Cell Theory- parts 1 and 2
Theodor Schwann reaches conclusion that plants and animal tissues are made of cells. He also organizes previous knowledge of cells into one theory that states: 1.) cells are organisms and all organisms are made of one or more cells and 2.) the cell is the basic unit of structure for all organisms.
Basic Unit of Life
Carl Braun reworks the cell theory, calling cells the basic unit of life.
Cell Theory- Part 3
Rudolph Virchow added the third part of the cell theory, stating that all cells come only from existing cells.