Page:A book of the Cevennes (-1907-).djvu/98



HERE exist but a limited number of terms wherewith to describe an infinite variety of natural objects that possess one common character, but differ from one another in every other particular. Needle, spike, pinnacle, spire, obelisk have to serve for all rocks that start up from the soil and terminate in a point. Ravine, gorge, fissure, chasm, canon have to be employed indiscriminately for those clefts in the surface, rents formed by the contraction on cooling of the earth's crust, or by the erosion of water. And yet all the difference in the world exists between spires of tufa and trap and those of granite or of limestone. The gorge down which swirls the river between calcareous walls is one thing, that which is cleft into a street lined