The earliest intimation the world at large received of the existence of the ‘Christianismi Restitutio’ of Servetus is to be found in Dr. Wm. Wotton’s ‘Reflections upon Learning, Ancient and Modern’ (London, 1694); but his reference is to nothing more than the passage bearing on the way in which the blood from the right side of the heart reaches the left. ‘The passage,’ says Wotton, ‘was communicated to him by his friend Mr. Charles Barnard, a very learned chirurgeon, who had had it transcribed for him by a friend who copied it from Servetus’ book.’ Wotton, therefore, had never seen the book himself. The copy from which the passage was transcribed, in all likelihood was the one which either was at the time or afterwards became the property of Dr. Mead. The next writer who refers to Servetus and his new views of the pulmonic circulation is Dr. James Douglas, in his ‘Bibliographiæ Anatomicæ Specimen’ (London, 1715). But neither had Douglas had an opportunity of examining the work for himself. He does no more, in fact, than copy the passage as given by Wotton. The first member of the medical profession who gave any account of Servetus’ physiological and psychological opinions from an actual survey of the ‘Christianismi Restitutio,’ from De Murr’s reprint, I believe to have been the late Dr. G. Sigmond, an amiable man and accomplished scholar, who has not been very long gone from among us. Sigmond, however, has left us the result of his study in an appreciative Dissertation in Latin and English; the introduction being in our mother tongue, the text in the old language. Sigmond’s work is entitled, ‘The Unnoticed Theories of Servetus; a Dissertation addressed to the Medical Society of Stockholm. 8vo., London, 1826.’ To his great honour, Dr. Sigmond is the first naturalist in these days who dared to see Michael Servetus for what he was in truth: an accomplished and sincerely pious man, but differing, to his sorrow, from both Catholics and Protestants on some of the dogmatical assumptions of their common creeds. The copy of the ‘Christianismi Restitutio’ which Dr. Sigmond possessed, as said above, was one of Dr. de Murr’s reprints, which had been bequeathed to him by his friend Dr. James Sims, for many years President of the Medical Society of London, a learned man and lover of books, who believed it to be the original--a belief not shared in by Sigmond, however, though he seems to have known nothing of De Murr or his edition. This copy, I think, must be the one which is now in the Library of the British Museum, purchased in 1855, when Sigmond, having lost the property he inherited from his father, seems to have parted with his books, though he only died in 1873.