Wall Street trader and author W. D. Gann's third book, first published in 1930, is the follow-up to his acclaimed 1923 publication Truth of the Stock Tape (1923). It aims to provide traders and investors alike with seven more years of Gann's own experiences-including mistakes made and losses incurred-by offering further tried and tested rules and methods that will help traders to study and learn how to select the proper stocks to buy and sell with a minimum of risk.