This book is pragmatical, not philosophical; a practical manual, not a treatise upon theories. It is intended for the men and women whose most pressing need is for money; who wish to get rich first, and philosophize afterward. It is for those who have, so far, found neither the time, the means, nor the opportunity to go deeply into the study of metaphysics, but who want results and who are willing to take the conclusions of science as a basis for action, without going into all the processes by which those conclusions were reached.