THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Vol. XYI. (U.S.), Ho. 20. MARCH, 1921. 



AWARD OF THE BOYLE MEDAL 



TO 



GEOEOE H. PETHYBRIDGE, B.Sc, Ph.D. 



1921 />" 



■ ^ 





DUBLIN : 

 PUBLISHED BY THE EOYAL DUBLIN SOCIETY, 



l.EINSTER HOUSK, DUBLIN. 



WILLIAMS AND NOEGATE, 

 14, HENRIETTA STREET, COVENT GARDEN, LONDON, W.C. 2. 



1921. 



Price One Shilling. 



