Penny Blood: Serial Sensation and Working-Class Entertainment — page 66: what you’re looking at

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

cH. v.] ELEVATIONS AND DEPRESSIONS. 49 neglect the product ee’, our equation will become klw (e +6) = 3 (A) — 5 (B), where A and B are now the volumes of the elevations above and depressions below the datum level. If in this equation we put w=1 and ¢ =0, it reduces to our former equation, If we put e=e' we get Zlwe = 3, (A) — 2 (B)...cccvcecececeee (2), which we may take as the general expression corresponding to any area of the surface. The relation just found manifestly assumes that before any compression took place, that is at the epoch when the crust first solidified, there were neither elevations nor depressions upon its surface; or in other words it assumes that the surface was one of equilibrium, like that of the ocean. And if the crust passed from a liquid, through a viscous, to a solid condi- tion, this seems to be the natural supposition. And this suppo- sition 1s strengthened by the fact that ail the rocks we see at the surface have either been water-deposited, or else have been protruded through water-deposited rocks. So that no evidence of any pristine inequahtties can be adduced which 1s opposed to this natural supposition, The tendency of the corrugations over a given area will be to form two systems at right angles to one another, thus re- lieving the whole compression. Where one corrugation inter- sects another, we.shall have a part of the volume common to both. But physically the same space cannot be occupied by two distinct volumes of rock. Hence at every such interseetion there must be an increase of altitude in the ridges sufficient to contain within the contour an additional volume equal to the common portion. This appears to occur in nature where a peak often occupies the place of intersection of two ranges, as if the denudation which has shaped out the mountains has had a greater amount of matter to remove in such a situation. The result expressed by the equation (2) may be extended to F. 4. GONG oOo SS (CO)