This is not a book for scientists. I will therefore go into no elaborate metaphysics, but will sketch as simply as I can what I mean by subconsciousness. I use the term for the region or zone within us which stores up the residues of past thoughts and experiences. Scientists tell us there are three realms of mind, the super-conscious, the conscious, the subconscious. The conscious mind is what we commonly use. It belongs purely to the objective world, and its instruments are the five senses. The subconscious mind is the storehouse for experiences on the human plane of man's long past. The super-consciousness is independent of the five senses. It is a faculty of perception closely akin to the One force in the Universe, which is inseparably related to all created things. It possesses the attributes of Infinity, is indestructible, immortal, undying. We may forget a fact for many years, then suddenly we remember it. I believe it has come back to us again across the threshold from the subconscious region to our consciousness or mind which is open to everyday observation. I have become convinced, by personal experience, of the existence in us of this region below the threshold of our ordinary conscious life. When I was young there were many problems I wished to solve, and in this effort human aid often failed me. My plan was to "sleep on" a problem, ardently desiring before "dropping off" that an answer might be accorded me. I suppose this desire was of the nature of prayer, though addressed to no Deity. Almost invariably the solution was clear and unmistakable to me in the morning. I lost this great advantage at the age of twenty-one, but even now I can sometimes "get at" a solution by leaving the question severely alone, after turning it well over in my mind. The solution will suddenly pop up, often weeks after I have tried to get at it, and when it comes there, it arrives apropos of nothing, so to speak. It simply dawns in the thick of quite other subjects, which happen at the moment to occupy my mind.