THE 



SCIENTIFIC PROCEEDINGS 



OF THE 



ROYAL DUBLIN SOCIETY. 



Tol. XVI. (N.S.), los. 25-29. AUGUST, 1921. 



25.— BIOLOGICAL STUDIES OF APHIS BUMIGIS L. A.— Appear- 

 ance OF Winged Foems. B. — Appearance of Sexual Forms. By 

 J. Davidson, D.Sc. From the Entomological Department, Institute 

 of Plant Pathology, Eothamsted Experimental Station, Harpenden,. 

 Herts. [Communicated by Professor G. H. Carpenter.] ,* 



26.— THE OCCUEEENCE OF DEWALQUEA IN THE COAL-BOEE 

 AT WASHING BAY. By T. Johnson, D.Sc, F.L.S., Professor of 

 Botany, Eoyal College of Science for Irelaml,-and Jane G. Gilmore, 

 B.Sc. " (Plates XI, XII.) 



27.— A SIMPLE FOEM OF APPAEATUS FOE OBSEEVING THE 

 EATE OF EEACTION BETWEEN GASES AND LIQUIDS, 

 AND ITS USE IN DETEEMINING THE EATE OF SOLUTION 

 OF OXYGEN BY WATEE UNDEE DIFFEEENT CONDITIONS 

 OF MIXING. By H. G. Becker, A.E.C.Sc.L, A.I.C, Demonstrator 

 in Chemistry, Eoyal College of Science, Dublin. 



28.— THE OCCUEEENCE OF A SEQUOIA AT WASHING BAY. By 



T. Johnson, D.Sc, F.L.S., Professor of Botany, Eoyal College of 

 Science for Ireland, and Jane G. Gilmore, B.Sc (Plates XIIL XIV.) 



29.— THE SOUECES OF INFECTION OF POTATO TUBEES WITH 

 THE BLIGHT FUNGUS, PHYTOPHTHOEA INFESTANS. 

 By Paul A. Murphy, B.A., A.E.C.Sc.L, Assistant in the Seeds and 

 Plant Disease Division, Department of Agriculture and Technical 

 Instruction for Ireland. 



[Authors alone are responsible for all opinions expressed in their Oommunicafions.'] 



DUBLIN : /v^^^^ '"^^ 



IV; AH ;l 



PUBLISHED BY THE EOYAL DUBLIN ^t)^9lETY,. 



].EINS'i'ER HOUSIC, DUBLIN. \ 



WILLIAMS AND NOEGATE, X^W/V 



14, HENRIETTA STREET, COVENT GARDEN, LONDON, ■W.C. 2. 



1921. 



Price Six Shillings and Sixpence. 



