A German mystic; studied medicine at Strasburg, and when there became acquainted with Goethe, who took a liking for him and remained his warm friend; settled as a physician at Elberfeldt and became professor at Marburg and at Heidelberg; he was distinguished for his skill in operations on the eye, and is said to have restored to sight without fee or reward 3000 poor blind persons; he is best known by his autobiography; Carlyle defines him as the German "Dominie Sampson."