PRESIDENTIAL ADDRESS. 



By T. W. Edge worth David, c.m.g., b.a. f.r.s., hou. d.sc. oxon. 



With Plates I, II. 



[Delivered to the Royal Society of N. 8. Wales, May 3, 19L1.~] 



The privilege having once more been accorded me of 

 addressing you as your President, I propose on this, the 

 ninetieth anniversary of the existence of our Society, to 

 touch briefly on the history of the Society during the last 

 twelve months, then to offer some notes on the chief 

 tectonic lines of Australia in particular and Australasia in 

 general. 



I— Royal Society of New South. Wales. 

 The number of members on the roll on the 30th of April, 

 1911, was 315 ; 12 new members were elected during the 

 past year. We have, however, lost by death two ordinary 

 members and two honorary members, and nine by resigna- 

 tion. There is thus left a total of 316 members. This 

 number, however, does not include the 14 honorary mem- 

 bers. The losses by death were — Honorary Members, Sir 

 William Huggins, Upper Tulse Hill, London, and Stanislao 

 Cannizzaro, Reale Universite, Rome. Ordinary Members, 

 Dr. Walter Spencer and W. J. MacDonnell. 



Dr. Walter Spencer, m.d. Brux., Was for fourteen years 

 a member of our Society, and for seven years was a member 

 of our Council, whose meetings he attended with great 

 regularity. Dr. Spencer is probably best known to our 

 scientific world as the President of the British Science 

 Guild, a position which he occupied at the time of his death 

 last year in Mexico City. He was most enthusiastic in his 

 devotion to the work of that body, and was chiefly instru- 

 mental in moving the Government of this State to provide 



A— May 3, 1911. 



