This concentration has been called attention to by some authors, who would make genius itself dependent entirely on attention, which Buffon speaks of as protracted patience. The mind that can take hold of the thread of a subject, and hold fast to it in all its intricacies to the end, is enabled to do so by superior attention. Concentration is more expressive, and under whatever name, the same mental state is designated. The profound student always falls into it when absorbed in his work, and becomes “absent-minded,” which is an expression commonly used to explain one of the most inexplicable mental states. When under control of the will, such concentration of mental power becomes priceless to its possessor. It is similar to the hypnotic state, with none of its disadvantages, and removed to a higher plane. The mind in this highly sensitive condition is impressible to the thought waves in the psychic-ether. On the other hand, when this concentration or attention is not controllable by the will, the condition of the unfortunate individual is most deplorable. He is lost in reverie, a dreamy, misty state of mind which unfits him for the duties of practical life. The difference is that between forgetfulness of duty, which has been the butt of endless ridicule by the world and of burlesque on the stage, and the reaches of thought attained by the philosopher, and the divine songs of the poet. The first essential requisite of profound thought is abstraction from the distractions of all matters except the one in hand. Ability to thus concentrate the mind at pleasure may be inherited or the product of education. In fact, correct education may be said to consist mainly in the control of the attention, and the ability to concentrate the mind on the one subject presented. The higher education of the future will recognize and give prominence to the cultivation of this hitherto ignored faculty. It is one of the possibilities of the future to encourage the culture of the sensitive faculty, and the results will be far more wonderful in normal education than now arises from what seems abnormal, and the product of chance. Sensitiveness, as has been shown in the preceding pages, is possessed by all in greater or less degree, and may be cultivated like any other mental quality. As its laws and conditions are more thoroughly understood and its inestimable value realized, it will become a part of all substantial educational training. THE EXTENSION OF THIS THEORY INTO THE LIFE BEYOND.--This theory, without calling to its aid spiritual beings, marks out the laws by which such beings may control the sensitive and become cognizant of the thoughts of each other. Man being a spirit, limited by a physical body, through the sensitive state, under certain conditions, he breaks away from his limitations and feels the waves of thought created by others through the psychic-ether.