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Had I chosen to have spoken, I might have said a great deal. I in no way admitted the theory of Humphry Davy--I still held out for the theory of proportional increase of heat, though I did not feel it. I was far more willing to allow that this chimney of an extinct volcano was covered by lava of a kind refractory to heat--in fact a bad conductor--which did not allow the great increase of temperature to percolate through its sides. The hot water jet supported my view of the matter. But without entering on a long and useless discussion, or seeking for new arguments to controvert my uncle, I contented myself with taking up facts as they were. "Well, sir, I take for granted that all your calculations are correct, but allow me to draw from them a rigorous and definite conclusion." "Go on, m