Golden key is A title of many volumes which have been written purporting to reveal the infallible method of winning at a lottery.
La Clef d’or or Veritable tresor de la fortune, 1810, has been reprinted from time to time in Lille, Belgium. It is based on the doctrine of sympathetic numbers, which the anonymous author claimed to have discovered from studying the works of Caglistro, Cornelius Agrippa and others.
Each number drawn, the author stated, is directly followed by five sympathetic numbers. For example, the number 4 is followed by its sympathetic numbers 30, 40, 50, 20, and 76. The claim is that with such knowledge it is an easy matter to win at a lottery. (Editorial note: Don’t bet on it.) A.G.H.