12 
A. GIBB MAITLAND, F.G.S. : 
Bird Day— A Plea for the Protection of Birds 
By J. G. Hay (Read March 14th, 1911). 
Nitrogen in the Economy of Nature. By M. A. 
Maurice Browne. (Read May 9th, 1911). 
Some Geographical Errors and their Influence 
upon Exploration and Settlements. By J. j- 
Hay (Read May 9th, 19x1). 
Relics of the Permo-Carboniferous Ice Age ii 
Western Australia.* By A. Gibb Maitland, p .G.S., 
BEING THE ANNIVERSARY ADDRESS OF THE PRESIDENT , 
Session 1910-1911. (Delivered July nth, 1911.) 
Plates I — XI. 
CONTENTS. 
PAGE. 
Discovery of the' Glacial Conglomerates and their Recent Studies 1 3 
The Glacial Conglomerate in the Gascoyne Valley 5 
The Glacial Conglomerate in the Minilva \ alley 9 
The Glacial Conglomerate in the Lyndon \ alley 
The Glacial Conglomerate in the Wooramel River 
The Glacial Conglomerate in the Irwin River 
The Northern Extension of the Lyons Conglomerate i 
Correlation of flic Deposits - • • • • ■ ■ • ’ : ’ ' ' 4 
The Lyons Conglomerate in Relation to some Theoretical ^ 
Questions 29 
Conclusion 
Introduction. 
My acceptance of the position of your President in- 
volved, amongst other things, the very responsible duty 
of delivering an anniversary address at the close ol my 
term of office. I wish, in the first place to express 
to you all my deep sense of gratitude for the honoui 
which you conferred, not, however, on myself persona y. 
but rather upon that field of scientific investigation m 
which I have laboured for the last quarter of a century. 
Such being the case, the appropriateness of devoting a 
little time to the consideration of observations, on some 
sd ecial department of geological science, has naturally sug- 
gested itself as being that which is expected from youi 
P resident, besides being more or less in accordance with 
tr aditional usage in like circumstances. 
Owing to causes beyond the President's control the delivery ol the 
Anniversary Address was deferred to this Session. 
