XIV 



CONTENTS OF THE FIKST VOLUME 



Thermal Waters of Bath— Calcareous Springs — Travertin of the Elsa— Baths 

 of San Vignone and of San Filippo, near Radicofani — Spheroidal Structure in 

 Travertin —Lake of the Solfatara, near Eome— Travertin at Cascade of Tivoli 

 Gypseous, Siliceous, and Ferruginous Springs— Brine Springs— Carbonated 

 Springs— Disintegration of Granite in Auvergne— Petroleum Springs— Pitch 



Lake of Trinidad . . page 387 



CHAPTER XVIII. 



REPRODUCTIVE EFFECTS OF RIVERS. 



Lake Deltas — Growth of the Delta of the Upper Rhone in the Lake of Geneva 



Playfair on the Origin of Lake Basins — 



Computation of the Age of Deltas 



-Course of the Po 



Recent Deposits in Lake Superior — Deltas of Inland Seas- 

 Artificial Embankments of the Po and Adige— Delta of the Po, and other Rivers 

 entering the Adriatic— Rapid Conversion of the Gulf into Land— Mineral 

 Characters of the New Deposits— Marine Delta of the Rhone— Various Proofs 

 of its Increase— Stony Nature of its Deposits— Coast of Asia Minor— Delta of 

 the Nile— Chronological Computation of the Growth of the Nile Mud at 

 Memphis . 416 



CHAPTER XIX, 



reproductive effects of rivers — continued. 



Deltas formed under the Influence of Tides— Basin and Delta of the Mississippi 

 Alluvial Plain— River-Banks and Bluffs— Curves of the River— Natural Rafts 

 and Snags— Mud-Lumps near the Mouths and their probable Origin— New 

 Lakes, and Effects of Earthquakes— Antiquity of the Delta— Section in Artesian 

 Well at New Orleans— Delta of the Amazons— Delta of the Ganges and Brah- 

 mapootra—Head of the Delta and Sunderbunds— Islands formed and destroyed 

 Crocodiles— Amount of Eluviatile Sediment in the Water— Artesian Boring 



at Calcutta — Proofs of Subsidence 



Age of the Delta — Convergence of Deltas 



Origin of existing Deltas not contemporaneous— Grouping of Strata and Stra- 



tification in Deltas 



Conglomerates— Constant Interchange of Land and Sea 



440 



CHAPTER XX. 



DESTROYING AND TRANSPORTING EFFECTS OF TIDES AND CURRENTS. 



Differences in the Rise of the Tides-Causes of Currents— Lagullas and Gulf 

 Currents— Velocity of Currents— Action of the Sea on the British Coast— Shet- 

 land Islands— Large Blocks removed— Isles reduced to Clusters of Rocks 

 Orkney Isles— Waste of East Coast of Scotland— and East Coast of England 

 Waste of the Cliffs of Holderness, Norfolk, and Suffolk-Eccles Church in 1839 

 and 1862— Sand-Dunes how far Chronometers-Silting up of Estuaries 

 Yarmouth Estuary-Suffolk Coast-Dunwich-Essex Coast-Estuary of the 

 Thames-Goodwin Sands-Coast of Kent-Formation of the Straits of Dover 

 South Coast of England-Sussex-Hants-Dorset-Portland- 

 Chesil Bank-Torbay-St. Michael's Mount, Cornwall-Coast of Brittany 4 



Origin of the 













