PHILOSOPHICAL TRANSACTIONS 
OF TOE 
ROYAL SOCIETY OF LONDON. 
Series A, Yol. 214. Pp. 433-445. 
[Plates 9-10.] 
ON ACQUIRED RADIO-ACTIVITY. 
BY 
Sir WILLIAM CROOKES, O.M., LL.D., D.Sc., Pres.R.S. 
LONDON: 
PUBLISHED BY THE ROYAL SOCIETY, 
AND SOLD BY HARRISON AND SONS ST. MARTIN’S LANE, 
DULAU AND CO., LTD., 37, SOHO SQUARE. W. 
1914. 
A 521. 
16.12.14 
Price One Shilling and Sixpence. 
