RECENT SUBMERGENCE OF COAST AT NARRABEEN. Dd 
deeper levels, surfaces corresponding with the old level of 
the Hunter River channel near Newcastle. If the subsidence 
is still in progress it must be exceedingly slow, at all events 
if it extends aS far inland as the great earth fold at Glen- 
brook to the west of Penrith. Accurate measurements 
taken by Mr. G.H. Knibbs, with a dumpy level, show that 
if movement at all is taking place in the way of the hinging 
down of the coastal strip between Penrith and the sea it 
must be something of the order of i¢oth to yvosths of an 
inch in the year. 
We would venture to suggest, with a view to the further 
elucidation of the question whether our coast at present is 
rising or falling, that a number of bench marks might be 
made along the coast, carefully levelled to, as was suggested 
at the Meeting of the Australasian Association for the 
Advancement of Science at Dunedin in 1904. 
Our thanks are specially due to the Under Secretary for 
Works, Mr. Davis, M. inst.c.5., for having so kindly placed 
the boring plant at our disposal, and also to the students 
of the University who rendered splendid service in the 
practical work of boring. 
