The Bodleian Library seven Vatican four British Museum one Bibliothèque Nationale, Paris two Biblioteca Riccardiana, Florence one Trinity College, Dublin one Gonville and Caius, Cambridge one The University of Leyden one Geneva one Turin one Erfurt three Vienna three S. P. Thompson two The first printed edition of the "Epistola" was prepared for the press in 1558 by Achilles Gasser, a man well versed in the science and philosophy of his day; another edition, which will probably be considered the _textus receptus_, is that which was prepared and published by Bertelli in 1868. No complete translation in any language of this historical work on magnetism was made until 1902, when Prof. Silvanus P. Thompson, of London, published his "Epistle of Peter Peregrinus of Maricourt to Sygerus of Foncaucourt, soldier, concerning the Magnet." Unfortunately, this translation was printed for private circulation and limited to 250 copies. Two years later, 1904, Brother Arnold, F. S. C., presented a memoir on Peregrinus, including a translation of the "Epistola," for the M. Sc. degree of Manhattan College, New York City, which translation was published some months later by the McGraw Publishing Company, New York. These are the only complete translations of the "Letter" of Peregrinus on the Magnet which have yet appeared. BROTHER POTAMIAN. FOOTNOTES: [1] See Klaproth, "Lettre à M. le Baron A. de Humbolt sur l'Invention de la Boussole." 1834; also Encyc. Brit., article _Compass_. [2] Provins, town 57 miles southeast of Paris. [3] Southey, "Omniana," Vol. I., p. 213, ed. 1812. [4] Annali di Matematica pura ed applicata. Rome, 1865. [5] Also in _Rees_ Encyclopedia, article _Compass_. CHAPTER II. NORMAN AND GILBERT. We have seen that in the thirteenth century the directive property of the lodestone was recognized by Peregrinus and used by him in his pivoted compass; and that in the fifteenth, Columbus discovered magnetic declination on sea as well as its variation with place.