SCIENCE AND INDUSTRY. 
For bringing all maps up to date, aerial photography is the quickest 
and most detailed. There should not be any difticulty in delimiting, 
pastoral and Crown lands, reserves, and woodlands; in owen stb 
information to the valuator on areas of scrub, stony, sandy, or swampy 
land, amounts of clearings, areas under cultivation, alterations in 
settled areas, drainage improvements, fencing, &¢.; in mapping flat 
stretches of country and sandridge country, large extents of which exist 
in Australia. 
Although the method may be unsuitable for forest valuation, yet 
accurate information as to the extent of our forest areas, the nature ot 
the surrounding country, and the type of woodland must be of great 
value. Round the coastal areas much useful work could be carried oui 
during low tides. 
Preliminary survey work could be made over large areas of unsur- 
veyed country, and preliminary sites determined for trial routes for 
detailed survey for railways, and reservoirs, and water conservation 
areas. 
A. Prea ror Co-operative Work. 
As these matters are well known to the military authorities and 
Lands Departments, it is hoped that some scheme of co-operation will 
be worked out at once to employ our well-trained aerial and aero~ 
photographie forces with those of the State Survey Departments in 
work such as that briefly mentioned above, but which at the present time 
is of such vital importance to our policy of Advance Australia. 
“At all pericds of the world’s history certain problems have 
impressed themselves on men’s minds as being of paramount importance. 
History affords many examples of this. From the doctrine of “the 
divine right of kings” to the question of “women’s suffrage” is a long 
step, but not a longer one than from the once all-absorbing theme 
which exercised the minds of men of science as regards the true nature 
of phlogiston to the present contest regarding the structure of the 
cobaltamines. Science has, however, this advantage over politics— 
that experiments devised to decide knotty questions are more easily 
carried out; and, further, that it is in the interests of no one to conceal 
the truth.” 
—SIR WILLIAM RAMSAY. 
482 
