THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Vol. XIII. (KS.), lo. 8. JUKE, 1911. 



IS ARCH^OPTERIS A PTERIDOSPERM ? 



BY 



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



PROFESSOR OF BOTANY IN THE ROYAL COLLEGE OF SCIENCE FOR IRELAND. 



(PLATES IV.-VI.) 



[A uffiors alone are responsible for all opinions expressed in their Communications-] 



DUBLIN : 



PUBLISHED BY THE EOYAL DUBLIN SOCIETY, 



LEINSTER HOUSE, DUBLIN. 

 WILLIAMS AND NOEGATE, /^'^^8^f»an'>'S/,: 



14, HENRIETTA STREET, COVENT GARDEN, LONDON, W.B. xyg _ 



1911. \ ^ 



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