416 Notices of Memoirs — British Association. 



Fj. p. Culverwell. — An Examination of Croll's and Ball's Theory of 



Ice Ages and Genial Ages, 

 Prof. J. F. Blahe. — On the Mechanics of an Ice Sheet. 

 Bev. E. Jones. — Eeport of the Committee on the Elbolton Cave. 

 Bev. E. Jones. — Eeport of the Committee on the Calf Hole Cave. 

 Prof. W. Boyd-DawMns. — On the Permian Strata of the North of the 



Isle of Man. 

 Prof. W. Boyd-DawMns. — The Carboniferous Limestone, Triassic 



Sandstone, and Salt-bearing Marls of the North of the Isle of Man. 

 Sir Henry PTowortli. — Strictures on the Current Method of Geological 



Classification and Nomenclature, with Proposals for its Eevision. 

 Montgomerie Bell. — The Pleistocene Gravel at Wolvercote, Oxford. 



B. Bruce Foote. — Prehistoric Man in the Old Alluvium of the Sabar 

 Mati Eiver in Guzerat. 



Prof. W. A. Eerdman. — Eeport of Committee on the Marine Zoology 

 of the Irish Sea. 



C. Davison. — Eeport of the Committee on Earth Tremors. 



Dr. H. J. Johnston- Lavis. — Eeport of the Committee on the Volcanic 



PhenoiBena of Vesuvius. 

 Prof. W. J. Sollas. — Eeport of the Committee on the Investigation of 



a Coral Eeef. 

 Prof W. Eennessy. — On the Shape of the Banks of Small Channels 



in Tidal Estuaries. 

 C. E. de Bance. — Eeport of the Committee on Underground Waters. 

 W. W. Watts. — On a Keuper Sandstone cemented by Barium 



Sulphate, from the Peakstones Eock, Alton, Staffordshire. 



Titles of Papers bearing on Geology, read in other Sections : — 

 J. W. Thomas. — On the Chemistry of Coal Formation. 

 T. Johnson. — Chalk-forming and Chalk-destroying Algae. 

 Prof. Osborn. — On Certain Principles of Progressively Adaptive 



Variation observed in Fossil Species. 

 W. P. Pycraft. — The wing of Arcliceopteryx viewed in the light of 



that of some Modern Birds. 

 Dr. Scott. — The Structure of Fossil Plants in its bearing on 



Modern Botanical Questions. 

 A. C. Seward. — A Contribution to the Geological History of Cycads. 

 H. Stoves. — The Evolution of Stone Implements. 



j];^ On the Geology of the Plateau Implements in Kent. 



By Professor T. Eupert Jones, F.E.S., F.G.S.^ 

 n^HIS subject having been fully treated of by Prof. J. Prestwich, 

 i the requisite references to his various memoirs elucidating the 

 o-eneral o-eology of the local drift-deposits, the geological stages of 

 their formation, and the peculiar fiint-iraplements of the plateau 

 are given. He has shown that certain superficial soils on the North 

 Downs between Sevenoaks and Eochester contain numerous rudely 

 worked flints, discovered by Mr. B. Harrison ; and that these were 

 derived from a gravel, of very great antiquity, originally formed on 

 1 Read before Sections C and H, British Association, Oxford. 



