
Study associations consist of people who wish to increase their knowledge of a particular subject
or range of subjects; they may be professionals or amateurs. Some associations consist almost
entirely of specialists (e.g. the Royal Statistical Society); others (e.g. the Royal Geographical
Society and the Zoological Society of London) have a more general membership. The learned
societies usually have two grades of membership: fellows and members. Some also admit group
members (such as schools or libraries), ...