Penny Blood: Serial Sensation and Working-Class Entertainment — page 209: what you’re looking at

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

192 COMPRESSION AND VOLCANIC ACTION. [cu. xv. To express the increment of pressure due to the increment dx in the depth we must have dp = gudx _ p = 9P Vp +2 aii Integrating Vp +alog p=gB2 + C. At the bottom of the crust the depth is & and the pres- sure gpk ; . Vgpk—p) +2 log = P= 96 (k — 2), which is the equation connecting the pressure with the depth. To determine the relation among the constants we have already seen that p e Vi- Pp At the bottom of the crust the density is o, which we have hitherto assumed to be that of basalt, and the pressure i is there gpk, whence 8 a | rt gpk If then the mass of lava under consideration be taken as that which occupies unit of volume when it is in the state of magma, we have a V+—=1. gpk And . o=B8. That is to say that the mass of unit of volume of the magma is equal the mass of unit of volume of basalt. Conse- quently if the rock constituent be of the density of basalt the water constituent must be so likewise, which agrees with our previous conclusion. COMIC OOOKS.EO oo