In every chapter of this book, mention has been made of the money ? making secret which has made fortunes for more than five hundred exceedingly wealthy men whom I have carefully analysed over a long period of years. The secret was bought to my attention by Andrew Carnegie, more than a quarter of a century ago. The canny, lovable old Scotsman carelessly tossed it into my mind, when I was but a boy. Then he sat back in his chair, with a merry twinkle in his eyes, and watched carefully to see if I had brains enough to understand the full significance of what he had said to me.