Golden Key
Under this title have been published many volumes purporting to reveal an infallible method of attaining success in a lottery. La Clef d'or, or La Véritable trésor de la fortune, reprinted from time to time at Lille, is based on the doctrine of sympathetic numbers, which the author claims to have discovered. Each number drawn, he declares, has five sympathetic numbers which directly follow it. Thus the number 4 has for its sympathetic numbers 30, 40, 50, 20, and 76. Knowing this, of course, it is an easy matter to win fortune at a lottery.