Petri dish Petri dish A Petri dish (sometimes spelled "Petrie Dish" and alternatively known as a Petri plate or cell-culture dish), named after the German bacteriologist Julius Richard Petri, is a shallow cylindrical glass or plastic lidded dish that biologists use to culture cellssuch as bacteriaor small mosses. Modern Petri dishes usually feature rings and/or slots on their lids and bases so that when stacked, they are less prone to sliding off one another. Multiple dishes can also be incorporated into one plastic container to create a "multi-well plate". While glass Petri dishes may be reused after sterilization (via an autoclave at
Myth of the flat Earth a young Arthur that "man will discover in centuries to come" that the Earth is round, and rotates. Historical writers have identified a number of historical circumstances that contributed to the origin and widespread acceptance of the flat-earth myth. American historian Jeffrey Burton Russell traced the nineteenth-century origins of what he called the Flat Error to a group of anticlerical French scholars, particularly to Antoine-Jean Letronne and, indirectly, to his teachers Jean-Baptiste Gail and Edme Mentelle. Mentelle had described the Middle Ages as twelve ignorant centuries of "profound night", a theme exemplified by the flat-earth myth in Letronne's "On the