Explain the origin of springs, wells, and artesian wells?
By what changes have the metallic ores become accessible?
In what light, then, are we to regard disturbances of geological structure?
CHAPTER IV.
What is the object of the preceding chapters?
How can we arrive at a knowledge of the causes which have produced geological phenomena?
Have geological causes always operated with the same intensity?
How are the means of forming correct geological theories increasing?