THE SUB-OCEANIC DEPRESSION, ETC. 429 
the separate rivers, the Adour and the Garonne, would be 
formed, and the latter, uniting with the Dordogne, would 
pour its waters into the Bay of Biscay by the wide channel 
of the River Gironde. 
Then subsequently would be formed those minor depressions 
which are continuous with the present mouths of the Adour 
and the Gironde, the southern depression extending to the 
deep waters of Le Goul in the Fosse de Cap Breton, and the 
northern depression extending across the Continental Plat- 
form towards its edge to the north of the great Fosse. 
If I have rightly interpreted the eeological forces acting 
in the south-west European region during and after the 
Glacial Epoch, then the peculiarities of the sub-oceanic 
depressions of the Bay of Biscay have been accounted for 
by simple natural causes, and the origin of the Fosse de Cap 
Breton, which Reclus seemed to despair of elucidating, has 
been explained. 
I venture to think, therefore, that the facts and considera~ 
tions now adduced have removed one of the difficulties in 
the way of the general acceptance of the hypothesis of the 
sub-aerial erosion of those remarkable depressions in the 
sea-bottom that Professor Spencer and Professor Hull have 
so prominently brought before our notice in their highly 
interesting and important papers. 
DiIsScuUssION. 
The CyHarrman.—I think we must all feel much obliged to 
Professor Logan Lobley for the very useful contribution that he 
has made to this subject, which has completed that which Professor 
Hull read before. Some of the points he touched on he did not 
explain to us so fully as Professor Logan Lobley has done to-day. 
He seems to have explained the peculiar construction of this deep 
water basin very clearly to us. 
I hope those present will make remarks upon the subject. 
Mr. Davip Howarp.—The theory put forward by Professor Hull 
and supplemented by Professor Logan Lobley is exceedingly 
interesting. I cannot conceive such a localized action of water 
under the sea as to make a deep cut—unless under the most 
