THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Vol. XII. (I.S.), lo. 33. JULY, 1910. 



AGEICULTUKAL SEEDS AND THEIR WEED 

 IMPURITIES : A SOURCE OF IRELAND'S ALIEN 



FLORA. 



T. JOHNSON, D.Sc, F.L.S., 



PEOFESSOK OF BOTANY IN THE KOYAL COLLEGE OF SCIENCE, DUBLIN ; 



MISS R. HENSMAN. " 



(PLATES XXII., XXIII.) MS^fMtauflJ: 



\_A uthors alone are responsible for all opinions expressed in their Communicalions 



DUBLIN : 



PUBLISHED BY THE ROYAL DUBLIN SOCIETY 



LEINSTER HOUSE, DUBLIN. 



WILLIAMS AND NORGATE, 



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



1910. 



Price One S hilling . 



