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STA ,|*BA, 1*L~ Jr?m (Elarcntron A TREATISE ON ELECTRICITY AND MAGNETISM MAXWELL VOL. I. Uonfron MACMILLAN AND CO. PUBLISHERS TO THE UNIVERSITY OF Clarendon press Series A TREATISE ON ELECTRICITY AND MAGNETISM BY JAMES CLERK MAXWELL, M.A LLD. EDIN., P.E.SS. LONDON AND EDINBURGH HONORARY FELLOW OF TRINITY COLLEGE, AND PROFESSOR OF EXPERIMENTAL PHYSICS IN THE UNIVERSITY OF VOL. CAMBRIDGE I AT THE CLARENDON PRESS 1873 [All rights reserved] v, Y\ ; 4/w>wa . Depti I PREFACE. THE fact appear to ancients. that certain attract In bodies, other bodies, modern after being rubbed, was known the to times, a great variety of other phenomena have been observed, and have been found to be related to these phenomena of attraction. They have been classed under the name of Electric phe nomena, amber, ?i\eKTpov, having been the substance which they were first described. Other bodies, particularly the loadstone, and pieces of iron and steel which have been subjected to certain in have also been long known to exhibit phe nomena of action at a distance. These phenomena, with others related to them, were found to differ from processes, the electric phenomena, and have been classed under the name of Magnetic phenomena, the loadstone, /zayi^?, being found in the Thessalian Magnesia. These two classes of phenomena have since been found to be related to each oth