A man of science shall be our next witness: I mean Sir Humphrey Davy. He was a man eminently successful in the line of life which he chose, and deservedly so. A distinguished philosopher,--the inventor of the famous safety-lamp which bears his name, and has preserved so many poor miners from death by fire-damp,--a Baronet of the United Kingdom and President of the Royal Society;--his whole life seemed a continual career of prosperity. If learning alone were the road to happiness, this man at least ought to have been happy. Yet what was the true record of Davy's feelings? We have it in his own melancholy journal at the latter part of his life. He describes himself in two painful words: "Very miserable!" A man of wit and pleasure shall be our next witness: I mean Lord Chesterfield. He shall speak for himself: his own words in a letter shall be his testimony. "I have seen the silly round of business and pleasure, and have done with it all. I have enjoyed all the pleasures of the world, and consequently know their futility, and do not regret their loss. I appraise them at their real value, which in truth is very low; whereas those who have not experience always overrate them. They only see their gay outside, and are dazzled with their glare; but I have been behind the scenes. I have seen all the coarse pullies and dirty ropes which exhibit and move the gaudy machine, and I have seen and smelt the tallow candles which illuminate the whole decoration, to the astonishment and admiration of the ignorant audience. When I reflect on what I have seen, what I have heard, and what I have done, I cannot persuade myself that all that frivolous hurry of bustle and pleasure of the world had any reality. I look on all that is past as one of those romantic dreams which opium occasions, and I do by no means wish to repeat the nauseous dose for the sake of the fugitive dream." These sentences speak for themselves. I need not add to them one single word. The Statesmen and Politicians who have swayed the destinies of the world, ought by good right to be our last witnesses. But I forbear, in Christian charity, to bring them forward. It makes my heart ache when I run my eye over the list of names famous in English history, and think how many have worn out their lives in a breathless struggle after place and distinction. How many of our greatest men have died of broken hearts,--disappointed, disgusted, and tried with constant failure! How many have left on record some humbling confession that in the plentitude of their power they were pining for rest, as the caged eagle for liberty! How many whom the world is applauding as "masters of the situation," are in reality little better than galley-slaves, chained to the oar and unable to get free! Alas, there are many sad proofs, both among the living and the dead, that to be great and powerful is not necessarily to be happy.