[Marcu 28, 1907.) 
THE 
SCIENTIFIC TRANSACTIONS 
OF THE 
MONE wee IHIEN SOC] tly. 
VOLUME IX.—(SERIES IL) 
V. 
HLECTRO-MAGNETIC MASS. 
BY 
ARTHUR W. CONWAY, M.A., F.R.U.I., 
Professor of Mathematical Physics, University College, Dublin. 
DUBLIN: 
PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 
LEINSTER HOUSE, DUBLIN. 
WILLIAMS AND NORGATE, 
14, HENRIETTA STREET, COVENT GARDEN, LONDON, W.C. 
PRINTED AT THE UNIVERSITY PRESS, BY PONSONBY AND GIBBS. 
1907. 
Price One Shilling. _ MAY 
