Tracing figures in the ice is the oldest form of figure skating, especially during its first 200 years of existence, when it was a recreational activity practiced mostly by men. Combined skating, or "the sophisticated tracing of geometric figures by groups of skaters", dominated the sport for almost 50 years in England. "The Art of Skating", one of the earliest books about figure skating, was written by Robert Jones in 1772 and described five advanced figures, three of which were illustrated with large color plates. Jones' limited body of figures, which emphasized correct technique, were the accepted and basic repertoire of figures in 18th century England. The Edinburgh Skating Club, one of the oldest skating clubs in the world, described combined figures and those done by multiple skaters; interlocking figure eights were the most important. According to writer Ellyn Kestnbaum, the Edinburgh Skating Club required prospective members to pass proficiency tests in what became compulsory figures. The London Skating Club, founded in 1830 in London, also required proficiency tests for members and pioneered combined skating, which contributed to the evolution of school figures. Artistic skating in France, which was derived from the English style of figure skating and was influenced by ballet, developed figures that emphasized artistry, body position, and grace of execution. Jean Garcin, a member of an elite group of skaters in France, wrote a book about figure skating in 1813 that included descriptions and illustrations of over 30 figures, including a series of circle-eight figures that skaters still use today.