new "Academia Julia," founded at Helmstadt by Henry Julius, duke of Brunswick in 1576. Here he accompanied his pupils, and was restored to the company of his old friend Caselius, whom the duke had invited to his youthful establishment.
In 1591, Liddel, by the recommendation of his friend, and of Grunefeldt, an eminent civilian, was appointed to the lower professorship of mathematics in the new university, as successor to Parcovius, who had been removed to the faculty of medicine; and, on the death of Erhardus Hoffman in 1594, he succeeded to the first, or higher mathematical chair. This eminent station he filled during the course of nine years, giving instructions in geometry, astronomy, and universal geography, and keeping the information he communicated to his pupils, on a level with the dawning progress of discovery. In 1596, he obtained the degree of doctor in medicine, and, in a science which was not at that period considered as so completely abstracted from the circle of general knowledge as its practical extent now compels it to be, he acquired the same celebrity which he had achieved in philosophy and mathematics. He is said by his lectures and writings to have proved the chief support of the medical school of Helmstadt; he acted as first physician to the court of Brunswick, and enjoyed a lucrative private practice among the opulent families in the neighbourhood. In 1599, he was elected dean of the faculty of philosophy, a post of honour to which he was frequently re-elected, both by the faculties of philosophy and of medicine. Meanwhile, in the year 1603, he resigned to Henricus Schaperus the chair of mathematics, of which he had remained occupant, notwithstanding his labours in another science; and in the year following, he was chosen pro-rector of the university. The method of studying his profession, and his courses of public tuition had already made Liddel an author of no inconsiderable extent, and, about this period, the fame he had acquired probably induced him to present the academical works which he had written or superintended, in a distinct manner before the world. In 1605, was published "Disputationes Medicinales Duncani Liddelii Scoti, Phil. et Med. Doctoris, et Professoris Publici in Academia Julia Helmæstadtii. This work, filling four volumes 4to. contains the theses or public disputations maintained by himself and his pupils at Helmstadt from 1592 to 1606; it is dedicated as a mark of gratitude to his early friend and patron Craig, accompanied by the usual multitude of commendatory verses on the author and his works. This book is mentioned by the author of the memoirs of Liddel as having been reprinted at so late a period as 1720. In 1607, he produced a better known work, "Ars Medica, succincte et perspicue explicata," published at Hamburg. This work was dedicated to king James. A second edition was published at Lyons in 1621, and a third at Hamburg in 1628. As in other works on medicine of the period, the range of the author's investigation was not confined to subjects to which the term medical would now exclusively refer ; metaphysics were included. Into the merit of this, as a work on practical medicine, it would now be useless to inquire, and we may be content with ranking the merit of the author, according to the estimation of the work during the 17th century, which was by no means inconsiderable. At the time when the last mentioned work was published, motives which we cannot now discover, induced Liddel to retire for the remainder of his life to his native country, which he had frequently visited during his honoured residence abroad. It would appear that he privately left the university, as Caselius remarks that the duke of Brunswick, if aware of his intention, would probably not have permitted so active a teacher to leave his favourite institution, which was then falling into confusion. On his return, he passed through Germany and Italy, and finally took up his residence in
