Penny Blood: Serial Sensation and Working-Class Entertainment — page 220: what you’re looking at

Machine-transcribed from the original scan — historical spelling and the odd misread are preserved.

cu. xv.] COMPRESSION AND VOLCANIC ACTION. 203 formation of volcanic vents be accepted, it will be also apparent that the force which opens them will for the above reason be proportionally greater where the crust is thicker, so that their occasional occurrence on lofty plateaux 1s no argument against the theory. The conc!usions to which we have been led as to the cause of compression, and of the elevation of mountain ranges, have been arrived at independently, and entirely upon the grounds already mentioned. They appear however to be decidedly in accordance with geological observations, and agree well with the history given by Prof. Judd, in his recent work on Volcanoes, of the connection between volcanic activity and the elevation of mountain ranges. He there shows that the Alpine chains have been raised contemporaneously with the manifestation of strong volcanic outbursts along lines parallel to them. He appears to adopt in general what we may call the American theory of the formation of mountains, but he supplements it by specially connecting volcanic outbursts with the actual throes of their elevation. He does not appear however to trace the connection of cause and effect between the two as we have done. “The movements which resulted m the crushing and crumpling of the thickened mass of sediments along the Alpine line of weakness, also gave rise to the formation of a series of fissures from which volcanic action took place’®.” We should however expect that, had the crushing and crumpling arisen from any external cause, it would rather have kept fissures closed than opened them. It is the synchronism to which we desire to draw attention. Thus again: “We have abundant evidence that just at the period when these great movements were commencing which resulted in the formation of the great Alpine and Himalayan geanticlinal, earth-fissures were being opened upon either side of the latter® from which volcanic outbursts took place. At the period when the most 1 «¢ Volcanoes,” Chap. x. 2 Ibid. p. 297. 8 The word ‘‘latter’’ strictly should confine this assertion to the Himalayan range. But from the enumeration of the localities, most of which are European, this cannot be intended. Ibid. p. 298. . COLA @ NOO (CO)