THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Vol. XV. (U.S.), No. 7. MAECH, 1916. 



THE VERTICILLIUM DISEASE OF THE 



POTATO. 



BV 



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



ECONOMIC BOTANIST TO THE DEPARTMENT OF AGRICULTURE AND TECHNICAL INSTRUCTION 



FOR IRELAND. 



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V(\sonian , 



(PLATES ll-lll.) fo'NOV/7 



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DUBLIN: 



PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 



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