STRATIFIED ROCKS OF CHEMICAL ORIGIN.
Chemical Agency employed in the Formation of Mechanical Rocks--But
some Rocks produced almost exclusively by the Action of
Chemical Laws--Difference between a Mixture and a Solution--a
Saturated Solution--Stalactites and Stalagmites--Fantastic
Columns in Limestone Caverns--The Grotto of Antiparos in
the Grecian Archipelago--Wyer’s Cave in the Blue Mountains
of America--Travertine Rock in Italy--Growth of Limestone
in the Solfatara Lake near Tivoli--Incrustations of the Anio
--Formation of Travertine at the Baths of San Filippo and San
Vignone, 109