CLASS commonly denotes any group or set of people or things. This is clear in the use of the term with reference to school and examination groupings. When applied to social groups the term is sometimes used in the same way, and sometimes in the sense of "the higher or wealthier class" (in contrast with the mass of the people). In logic, and in science generally, the term class is not synonymous with any limited group. It means a kind; and a kind may be, but is not usually, a limited group. In any case this reference is not to number at all. A class may be known only through a single specimen (as sometimes happens in palaeontology) or it may consist of an endless stream of indi viduals or groups of individuals. In biology this term class has a definite or fixed place in the classificatory scheme—it is one of the kinds into which a "kingdom" is divided, "kingdom" being the most comprehensive class in the biological series.