Many subjects of deep philosophic import are treated of in this small volume, on none of which am I an authority. I feel that I may with justice be condemned as a "Jack of all Trades". Nevertheless I beg the patience and toleration of scholars whose studies have been more profound than mine, since no one who was unwilling to be a "Jack" could cultivate "Intuition", a plant of confused and intricate growth which has wound its tendrils round many noble trees and mingled its roots with those of the brightest flowers and most ineradicable weeds in the philosopher's garden. In philosophy, as in gardening and medicine, the work of the general practitioner must come before that of the specialist.