. The street railway review . able Rock probably formed thebed of this fall. Large portions of this rock fell in iSiS,1S2S, 1850 and 1S86, and the fragments are still visililescattered on the slope on the Canadian side. Geologists and other scientists find in the Falls a favoritetheme for theorizing. One of the interesting opinionsadvanced a few weeks ago was by Prof. John Level, ofNiagara, who holds that the recession of the Falls ischiefly caused by the breaking of the rock from e-xplosionsof air which becomes compressed beneath the falls until itexplodes, tearing off fragments of rock. One
. The street railway review . able Rock probably formed thebed of this fall. Large portions of this rock fell in iSiS,1S2S, 1850 and 1S86, and the fragments are still visililescattered on the slope on the Canadian side. Geologists and other scientists find in the Falls a favoritetheme for theorizing. One of the interesting opinionsadvanced a few weeks ago was by Prof. John Level, ofNiagara, who holds that the recession of the Falls ischiefly caused by the breaking of the rock from e-xplosionsof air which becomes compressed beneath the falls until itexplodes, tearing off fragments of rock. One or two writers hold that the gorge was originally acrack in the earth violently wrenched apart, and others thatit was washed out by ocean tides ; but the preyailing opinionis that the gorge was cut out by the river itself and this viewis substantiated by so much evidence that Professor C. of the United States Geological .Survey does notdeem the others worthy of serious consideration. \lalreSvfler/or loAeMKh^ lokp Hw. CROSS-SECTION OF GKKAT LAKES. The method by which the gorge has been cut away differsfrom the normal process of erosion, by the rubbing andpounding of rock fragments carrleil along by the stream ;Niagara carries uo such rock fragmeuls. I lere the lowerstrata of shale are cut out by llie rolling .ibonl of largemasses of limestone at the base of the preci|)ice allowingthe limestone at the crest to break off. Professor (xilbert predicts the time when there will be no
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
