Penny Blood: Serial Sensation and Working-Class Entertainment — page 210: what you’re looking at

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

cH. xv.] COMPRESSION AND VOLCANIC ACTION. 193 Substituting for a and §, our equation may now be written 1—V pk lok-—-e« “V8 p gpk" Vp E * We are so little acquainted with the behaviour of matter under the circumstances which environ it beneath the earth’s crust that it is dangerous to speculate upon the laws which govern it, but it is thought that the consequences of the hypo- theses above made will be sufficiently near the truth to justify our arguing upon them. At the surface 2 = 0, and then 1—-V, gpk p_o =" Jog PP" _ PP V p gpk Vp — ° 3 whence } log gpk _o ~ P log ZP” _ (1 P| cP? gpk The condition that V <1 is satisfied if 1— _P < ? , gpk p Now sok is necessarily <], and “> 1, Consequently this condition is always satisfied, and therefore if there be any water-substance at all in the magma it will raise the lava to the surface under the supposition that the same identical water remains always in the same portion of lava. | If V=1 we obtain p=—(c—p)k, This value is without meaning, but being the same that we obtain from the equation p=go|do+0 after determining the constant by the condition that p= gpk at the bottom of the crust and then giving to a the value zero, that being the value we should arrive at when there is no water in the lava, it verifies our result. F. 13 COMMUC NOO SS (CO)