38 | Reports and Proceedings— 
since their formation. He favoured the view that the waters of the 
lake were dammed by the ice towards the north. An account was 
given of some quartzite flakes, apparently chipped by human agency, 
in one of the terraces of this lake. On the recession of the ice the 
southern drainage-channel was abandoned, and a northerly one 
opened out. 
7. Old Drainage-channels.—Throughout the whole region old drain- 
age-channels appear to have been occupied by southerly running 
rivers (where the present drainage is northerly), and are considered 
to have carried away the waters draining from the foot of the ice. 
Some of these valleys have been blocked by moraines in the Duck 
Mountains, the result of local glaciers. 
II.—November, 21, 1888.—W. T. Blanford, LL.D., F.R.8., Presi- 
dent, in the Chair. 
W. Whitaker, Esq., B.A., F.R.S., F.G.8., who exhibited a series 
of specimens from the deep boring at Streatham, made some remarks 
upon the results obtained, of which the following is an abstract :— 
After passing through 10 feet of gravel, etc., 153 of London Clay, 
884 of Lower London Tertiaries, 623 of Chalk (the least thickness 
in any of the deep borings in and near London), 283 of Upper 
Greensand, and 1884 of Gault, at the depth of 10814 feet hard 
limestone, mostly with rather large oolitic grains, was met with. 
This, with alternations of a finer character, sandy and clayey, lasted 
for only 883 feet, being much less than the thickness of the Jurassic 
beds, either at Richmond or at Meux’s Boring. The general character 
of the cores showed a likeness to the Forest Marble, and the occurrence 
of Ostrea acuminata agreed therewith. 
At the depth of 1120 feet the tools entered a set of beds of much 
the same character as those that had been found beneath Jurassic 
beds at Richmond, and beneath Gault at Kentish Town and at 
Crossness. The softerand more clayey components were not brought 
up; the harder consist of fine-grained compact sandstones, greenish- 
grey, sometimes with purplish mottlings or bandings, and here and 
there wholly of a dull reddish tint. With these there occur hard, 
clayey, and somewhat sandy beds, which are not calcareous, whilst 
most of the sandstones are. Thin veins of calcite are sometimes to 
be seen, and at others small concretionary calcareous nodules ; but 
no trace of a fossil has been found. 
The bedding is shown, both by the bands of colour, and by the 
tendency of the stone to fracture, to vary generally trom about 20° 
to 80°, 
In the absence of evidence it is hard to say what these beds are, 
and the possibilities of their age seem to range from ‘Trias to De- 
vonian. It is to be hoped that this question may be solved, as on 
it depends that of the possibility of the presence of Coal-measures in 
the district ; and Messrs. Docwra, the contractors of the works, have 
with great liberality undertaken to continue the boring operations at 
their own expense for at least another week. 
Details of the section will be given in a forthcoming Geological 
