(January, 1909. }. 
THE 
SCIENTIFIC TRANSACTIONS 
OF THE 
MON sean SOC LENT Yy. 
VOLUME IX.—(SERIES IL.) 
IDG 
THE SECONDARY RADIATION EXCITED BY y RAYS. 
BY 
F. EK. HACKETT, M.A., Pu.D., University College, Dublin. 
[ COMMUNICATED BY PROFESSOR J. A. MCCLELLAND, M.A., D.SC, | 
1D) (Os 183 JnICINY ¢ 
PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 
LEINSTER HOUSE, DUBLIN. 
WILLIAMS AND NORGATE, A 
14, HENRIETTA STREET, COVENT GARDEN, LONDON, W.C. ier 
PRINTED AT THE UNIVERSITY PRESS, BY PONSONBY AND BOSE o> peti 
\ tei, : vee 
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