Although his early schooling took place in Killyleagh, Sloane moved at the age of nineteen to London, where he studied medicine for the next four years. He then moved to Paris for three months, where he worked at the Jardin Royale des Plantes and the Hopital de la Charite. In 1683, he took his doctorate at the University of Orange, then attended the University of Montpellier until late May 1684. Sloane later received a doctor of medicine degree from the University of Oxford in 1701. Throughout his studies, Sloane was particularly interested in chemistry and botany, forming close relationships with well-known people in those fields: John Ray, Robert Boyle and Joseph Pitton de Tournefort.