May, igso 



6 



PROCEEDINGS 



ROYAL IRISH ACADEMY 



Volume XXX V, Sixtion B, No. 6 



W. B. WRIGHT 



MINOR PERIODICITY IN GLACIAL 



RETREAT 



DUBLIN 



HODGES, FIGGIS, & CO. 



LONDON: VVir.I.IAMS & NOKGAIK 



1920 



Price One S/iiiling 



