 Returning to Europe in 1909, Blatter chose to complete his theological studies in Hastings, South East England, where exiled Jesuits from two French provinces had opened a school of theology.During this time, Blatter also spent much time researching and compiling his papers, "Flora of Aden", at the Royal Botanic Gardens in Kew.Ordained as a priest on 25 August 1912, Blatter spent another year in the Netherlands, before returning to London to compile data for his next effort, "Flora Arabica".