Editorial Notes. 435 
there were joint discussions with other sections on the Mid-Scotland 
Canal, the Oldest Land Flora, and that well-worn subject, the Age 
of the Earth. We are not aware that any new geological evidence 
has recently come to light bearing on this question, which has been 
abundantly discussed in recent years by Professor Sollas and others. 
x * * x x 
Dr. J. 8. Fuert, F.R.S., President of Section C, devoted his address 
to the fascinating subject of Experimental Geclogy, with special 
reference to the work of Sir James Hall of Dunglass, and its bearing 
on modern research. We greatly regret that we are unable to afford 
space to reprint this address in full in the Magazine. It should be 
read by all petrologists, to whom it will afford much food for thought. 
We feel sure that few geologists of the present day are acquainted 
with the wonderful work carried out by Hall a century ago in the 
investigation of the behaviour of rocks and minerals at high 
temperatures, and we must be grateful to Dr. Flett for his 
appreciative sketch of this great Scotsman and great geologist. 
* *k * *k * 
Tur excursion of the Geclogists’ Association to Belgium from 
20th August to 3rd September was attended with much success. 
The general direction of the excursion was in the competent hands 
of Dr. L. Dudley Stamp, and the domestic arrangements were 
excellently and efficiently managed by Miss M.8. Johnston, Mr. B.S. 
Herries, and Mr. W. Wright. Consequently everything went off 
without a hitch, in spite of the difficulty of securing accommodation 
for a party of nearly fifty in remote places. The following gentlemen 
most kindly conducted excursions to the localities which they have 
made their special study: M. A. Renier, M. F. Halet, and Dr. E. 
Asselberghs, of the Geological Survey of Belgium; Professor J. 
Cornet, of the School of Mines, Mons; M. Eug. Mailleux, of the 
Musée Royale d’ Histoire Naturelle, Brussels ; the Abbé G. Delépine 
of the Catholic University of Lille, Dr. P. Pruvost, and M. Kaisin. 
The party stayed at Brussels, Mons, Nismes (for the Couvin district), 
and Namur, and visited numerous sections in the Devonian, 
Carboniferous, Cretaceous, and Tertiary rocks, as well as obtaining 
a glimpse of the Silurians of the Brabant massif and inspecting the 
vast porphyry quarries at Quenast, the source of so much of the 
horrible pavé of Belgian roads. Professor Dollo also kindly showed 
the party over the geological department of the Musée Royale at 
Brussels, and gave a most interesting description of the wonderful 
collection of reptilian remains, while on the same occasion M. Rutot 
explained the collection of flint implements. The organizers of this 
excursion are to be heartily congratulated on the success that 
attended their labours, which must have been of the most arduous 
nature. 
