501st ORDINARY GENERAL MEETING. 
HELD IN THE HOUSE OF THE ROYAL SOCIETY OF ARTS 
ON MONDAY, JANUARY 24ru, 1910, AT 4.30 p.n. 
Proressor E. Huu, LLD., F.R.S. (VICE-PRESIDENT), 
IN THE CHAIR. 
The Minutes of the previous Meeting were read and confirmed, and 
the following announcements made on behalf of the Council : — 
The Rev. Canon R. B. Girdlestone, M.A., late Chairman of Council, 
had been appointed a Vice-President in the place of the late 
W. H. Hudleston, Esq., F.R.S. 
The Rev. Griffith Thomas, D.D., Principal of Wycliffe Hall, Oxford, 
had been appointed to a seat on the Council in the place of 
Colonel T. H. Hendley, C.I.E., resigned. 
Dr. W. A. Shann, of Woking, had been elected an Associate of the 
Victoria Institute. 
The CHAIRMAN then introduced Professor H. Langhorne Orchard, 
the author of the subsequent paper and winner of the Gunning 
Prize 1909. He was certain that all those present would derive 
the greatest pleasure and assistance from the paper, which he might 
mention had been placed first in their independent reports by all 
three of the arbiters appointed to consider the essays submitted for 
the Gunning Prize, so that at their subsequent meetings the task 
of recommending the award had not proved a difficult one, though 
none of them had agreed as to the order of the other excellent 
essays submitted. 
Professor H. LANGHORNE ORCHARD, who was received with great 
applause, then proceeded to read the following paper :— 
