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
French butter dish French butter dish A French butter dish is a container used to maintain the freshness and spreadable consistency of butter without refrigeration. This late 19th century French-designed pottery crock has two parts: a base that holds water, and a cup to hold the packed butter which also serves as a lid. The cup containing butter is placed into the base, where water creates an airtight seal that keeps the air (and thus oxygen) away from the butter so that refrigeration is not needed, and the butter can be used in its soft form. This method will keep butter for around