The appearance of his Handbuch der Physiologie des Menschen between 1833 and 1840 (translated into English by Dr William Baly, and published in London in 1842) marked the beginning of a new period in the study of physiology.
Whether inorganic salts are directly absorbed has been a matter of much discussion; it has, however, been directly proved by the experiments of Kunkel (Archiv fiir die gesamte Physiologie des Menschen and der Tiere, lxi.) and Gaule.
De Visser, Die nicht Menschen-Gestaltigen Gotter der Griechen (Leiden, 1903).
His first treatise was Die Naturgeschichte des Menschen (in 2 vols., Kempten, 1831).