The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view. In contemporary writing parallax can also be the same story, or a similar story from approximately the same time line, from one book told from a different perspective in another book.
In 1838, Theodor Schwann and Matthias Schleiden were enjoying after-dinner coffee and talking about their studies on cells. It has been suggested that when Schwann heard Schleiden describe plant cells with nuclei, he was struck by the similarity of these plant cells to cells he had observed in animal tissues.
Galileo saw details of insect eyes with two crude lenses. 2. Robert Hooke used simple lenses to observe cork in which he saw tiny compartments he called cells (cellulae). 3. van Leeuwenhoek saw protistans, sperm, and bacteria with his lenses and microscopes. B. The Cell Theory. 1. Schleiden (a botanist) and Schwann (a zoologist): believed that all plants and animals consist of cells. 2. Virchow: cells come from preexisting cells.