16. Until now the study of the spiritual principle, the study of metaphysics, has been purely speculative and theoretical. In Spiritism it is all experimental. By the aid of the medianimic faculty, more developed in our day, - far more generalized and better studied, - man is found possessed of a new instrument of observation. Mediumship has been for the spiritual world that which the telescope has been for the astral, and the microscope for the world of infinitesimalities. It has allowed exploration of it, study, and one might say vision, of its connection with the corporeal world - of the distinction in the living man between the intelligent and the material being; for they can now be seen to act separately. Once in relation with the inhabitants of the spirit-world, one has been able to follow the soul in its ascending march, in its migrations, in its transformation. At length the study of the spiritual element is made practical; this was wanting to all preceding commentators on Genesis; thus their inability to comprehend it, and rectify its errors.