300 Apparent objections to the Glacial Theory, 



portion of the northern hemisphere, yet no very great amount of dis- 

 locating effects was observed, at least nothing like the production 

 of a line of elevated land. We may hence form some idea of the ef- 

 fects which would be produced if a line of mountains one hundred 

 miles long, and not above two or three thousand feet high, were 

 suddenly thrust up beneath the waters of the sea. The vibrations 

 produced in the superincumbent fluid would be proportionally great, 

 and the waves rushing over shallows and lowlands, comparatively 

 enormous. We may therefore fairly infer, that greater intensities of 

 force would produce greater waves, while the motion caused in the 

 water over the dislocations, supposing such to be formed, would 

 tend to remove the fragments produced." — De la Beches Theor. 

 Geolpp. 202-203. 



" At Tabahuana, during the earthquake of February 1835, when 

 the sea was observed to retire, so that vessels at anchor in seven 

 fathoms water were aground, and all the rocks and shoals in the bay 

 were visible, an enormous wave was seen forcing its way between 

 the western passage, which separates Quiriquina Island from the 

 main land. This immense wave passed rapidly along the western 

 side of the Bay of Concepcion, sweeping the steep shore of every 

 thing moveable within thirty feet, vertically from the high water 

 mark. It broke over, dashed along, and whirled about the shipping, 

 as if they had been light boats ; it overflowed the greater part of 

 the town, and then rushed back with such a torrent, that almost 

 every thing moveable, which the earthquake had not buried, was 

 carried out to sea. In a few minutes, a second wave returned more 

 powerful than the first. After another awful suspense of a few mi- 

 nutes, a third enormous swell was observed approaching, larger than 

 either of the former waves. The island of Juan Fernandez suffered 

 much. Great waves swept the shores of the island, after the sea 

 had retired, so much that old anchors were seen at the bottom of 

 the anchorage." — BakeweWs Introd. Geol. p. 43. 



" During this earthquake a permanent elevation of the ground of 

 about nine feet took place, and the sea rose to the height of from 

 thirty to forty feet, sweeping over a great extent of land, and tearing 

 away the various obstacles opposed to its progress. If we suppose 

 mountains several thousand feet high were elevated by similar causes, 



