"Now, Buckland," said Mr. Stephenson, "I have a poser for you. Can you tell me what is the power that is driving that train?" "Well," said the other, "I suppose it is one of your big engines." "But what drives the engine?" "Oh, very likely a canny Newcastle driver." "What do you say to the light of the sun?" "How can that be?" asked the professor. "It is nothing else," said the engineer. "It is light bottled up in the earth for tens of thousands of years--light, absorbed by plants and vegetables, being necessary for the condensation of carbon during the process of their growth, if it be not carbon in another form; and now, after being buried in the earth for long ages in fields of coal, that latent light is again brought forth and liberated, made to work as in that locomotive, for great human purposes." On the 12th of August 1848, this great, good man--one of the truest heroes that ever lived, and one of the greatest benefactors of our country--passed from among us, leaving his son, Robert, to develop and extend the great work of which he had laid the foundation. Among one of the first railways of any extent of which Robert Stephenson had the laying out, was the London and Birmingham; and it is related, as an illustration of his conscientious perseverance in executing the task, that in the course of the examination of the country he walked over the whole of the intervening districts upwards of twenty times. Many other lines, in England and abroad, were executed by him in rapid succession; and it was stated a few years ago, that the lines of railway constructed under his superintendence had involved an outlay of L70,000,000 sterling.