THE LETTER OF
PETRUS
PEREGRINUS
ON THE MAGNET, A.D. 1269
TRANSLATED BY
BROTHER ARNOLD, M.Sc.
PRINCIPAL OF LA SALLE INSTITUTE, TROY
WITH
INTRODUCTORY NOTICE
BY
BROTHER POTAMIAN, D.Sc.
PROFESSOR OF PHYSICS IN MANHATTAN
COLLEGE, NEW YORK
NEW YORK
McGRAW PUBLISHING COMPANY
MCMIV
Copyright, 1904, by
McGraw Publishing Company