THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Vol. XY. (U.S.), No. 21. JUNE, 1917. 



FURTHER OBSERVATIONS ON THE CAUSE OF 

 T HE COMMON DRY-ROT OF THE POTAT, 

 TUBER IN THE BRITISH ISLES. 



BY 



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



ECONOMIC BOTANIST TO THE DEPARTMENT OF AGRICULTURE AND TECHNICAL INSTRUCTION 



FOR IRELAND. 



AND 



H. A. LAFFERTY, 



ASSOCIATE OF THE ROYAL COLLEGE OF SCIENCE FOR IRELAND, ASSISTANT IN THE SEEDS 

 AND PLANT DISEASE DIVISION OF THE DEPARTMENT. 



(PLATES Vl-Vll.j 



[A uthors alone are responsible for all opinions expressed in their Communications. J, 



DUBLIN: 

 PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 



LKIN8TKK. HOUSE, DUBLIN. 

 WILLIAMS AND NOEGATE, 



14, HENRIETTA STREET, CO VENT GARDEN, LONDON, W.C. 

 1917. 



Price One Shilling and Sixpence. 



