Romaine lettuce is sometimes called Cos, or cos type after the name of the Greek island where romaine lettuce is said to have originated. It may also, less commonly, be referred to as Roman or Manchester lettuce.Occasionally, romaine lettuce may be referred to by the name of a cultivar. Some widely-grown romaine cultivars include Parris Island Cos, Valmaine, Little Gem and Dark Green Cos.. Romaine is one of four main categories of lettuce.omaine lettuce is sometimes called Cos, or cos type after the name of the Greek island where romaine lettuce is said to have originated. It may also, less commonly, be referred to as Roman or Manchester lettuce.
I. Petitio Principii : (circular reasoning, circular argument, begging the question) in general, the fallacy of assuming as a premiss a statement which has the same meaning as the conclusion.
III. The reason petitio principii is considered to be a fallacy is not that the inference is invalid (because any statement is indeed equivalent to itself), but that the argument can be deceptive. A statement cannot prove itself. A premiss must have a different source of reason, ground or evidence for its truth from that of the conclusion. Abstract: Petitio principii (circular) argument is described and several examples are noted.