THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Vol. XIII. (I.S.), No. 36. MAECH, 1913. 



ON PURE CULTURES OF PHYTOPHTRORA 

 INFE8TAN8 DE BARY, AND THE DEVELOP- 

 MENT OF OOSPORES. 



BY 



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



ECONOMIC BOTANIST TO THE DEPARTMENT OF AGRIGULTUEE AND TECHNICAL INSTEUCTION 



FOR IRELAND ; 



AND 



PAUL A. MURPHY, A.R.C.Sc.I. 

 (PLATES XLV, XLVI.) 



[/I ufhors alone are responsible for all opinions expressed in their Oommunicaiioiis.'] . 



DUBLIN: 



rU]}LISHED BY THE ROYAL DUBLIN SOCIETY, 



LEINSTEll HOUSE, DUBLIN. 



WILLIAMS AND NORGATE, 



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



1913. _^ 



Price One Shilling and Sixpence. /'^ 



' JUL 7 19^^' 



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