Students of history find a continuous chain of reference to the mysterious influence of one human mind over that of others. In the earliest records, traditions and legends may be found giving reference to the general belief that it was possible for an individual to exert some weird uncanny power over the minds of other persons, which would influence the latter for good or evil. And more than this, the student will find an accompanying belief that certain individuals are possessed of some mental power which bends even "things" and circumstances to its might. There is but one Truth, and it manifests on all planes - the Spiritual; the Mental; and the Physical - and manifestations agree and coincide. So no Mentalist need fear the test of Physical Science, for each plane will bear out the facts and phenomena of the ones below or above it - the Three are but varying phases of One. In this little work we shall hug close to the plane of Physical Science, because by so doing we will be able to make the subject much clearer to many than if we had attempted to express the teaching in Metaphysical terms. There is no contradiction in the end. Each bit of Truth must dovetail into every other bit, for all are parts of the Whole.