PRESIDENTIAL ADDRESS. 



By W. S. Dun. 



With Diagram. 



[Delivered to the Royal Society of N. S. Wales, May 7, 1919.'] 



My four predecessors in the Presidential Chair have had 

 to address you under the shadow of the world's greatest 

 calamity, and though the cloud lias lifted, the beams of 

 peace are still struggling to pierce the gloom. During 

 the calm to which we look forward, our Society will 

 endeavour to maintain its reputation, and assist both the 

 State and the Empire in the stimulation of industry by the 

 aid of scientific research. Co-ordination of control and 

 resources is necessary, and the numerous problems sur- 

 rounding these questions will require the most careful 

 thought and investigation — matters which will appeal to 

 all our members. 



I have the privilege of welcoming to-night two of our 

 most esteemed members, whose names are more than 

 household words to us and Australian science, Lt. Colonel 

 Professor David, c.m.g., D.s.o., f.r.s., and Major Professor 

 Pollock, d.Sc, f.r.s., who for three years have given their 

 advice and services to the Allies, and we are thankful to 

 say, in spite of war risks, wounds and privations, have 

 returned to their homes, we trust to work for many years 

 in their respective fields of knowledge. I speak with feel- 

 ing on this occasion; since Professor David has for the past 

 thirty years been my instructor and close personal friend 

 and advisor, and while all have been anxious to welcome 

 him home, I think no one has a greater right than I have. 

 The Society will gain a Councillor of the ripest experience; 



A— May 7, 1919. 



