May, 1887. ] 
- THE 
SCIENTIFIC TRANSACTIONS 
OF THE 
meOvead  OUBIEIN SOCTED X. 
VOLUME III. (SERIES II.) 
XITI.—ON THE CAUSE OF IRIDESCENCE IN CLOUDS. By G. JOILNSTONE 
STONEY, M.A., D.Sc., F.R.S., a Vicz-Presipent R.D.S. 
DUBLIN: 
PUBLISHED BY THE ROYAL DUBLIN SOCIETY. 
PRINTED AT THE UNIVERSITY PRESS, BY PONSONBY AND WELDRICK, 
PRINTERS TO THE SOCIETY. 
1887. 
Price One Shilling. 
By > 
