One had to guard against all those perils! You say well! It was a struggle, and consequently an exciting life." "The miners of Alva have been more favored than the miners of Aberfoyle, Mr.Starr!" "Ay, Harry, so they have," replied the engineer.
"Indeed," cried the young man, "it's a pity that all the globe was not made of coal; then there would have been enough to last millions of years!" "No doubt there would, Harry; it must be acknowledged, however, that nature has shown more forethought by forming our sphere principally of sandstone, limestone, and granite, which fire cannot consume." "Do you mean to say, Mr.Starr, that mankind would have ended by burning their own globe ?" "Yes! The whole of it, my lad," answered the engineer.

"The earth would have passed to the last bit into the furnaces of engines, machines, steamers, gas factories; certainly, that would have been the end of our world one fine day!" "There is no fear of that now, Mr.Starr.But yet, the mines will be exhausted, no doubt, and more rapidly than the statistics make out!" "That will happen, Harry; and in my opinion England is very wrong in exchanging her fuel for the gold of other nations! I know well," added the engineer, "that neither hydraulics nor electricity has yet shown all they can do, and that some day these two forces will be more completely utilized.

But no matter! Coal is of a very practical use, and lends itself easily to the various wants of industry.

Unfortunately man cannot produce it at will.

Though our external forests grow incessantly under the influence of heat and water, our subterranean forests will not be reproduced, and if they were, the globe would never be in the state necessary to make them into coal." James Starr and his guide, whilst talking, had continued their walk at a rapid pace.