This internal, invisible body-of-light [_Lichtkorper_] is also the organ and the center of all the higher and spiritual powers of the human organization. For it is easily conceivable that a partial projection of this life of light which is latent in the sound organic body should produce such phenomena, while its complete projection, or rather total separation, would have death for its result, or rather would itself be death. A truly scientific view of nature can easily enter into or allow the legitimacy of this idea. The true rule, however, and standard for the right decision of phenomena of this kind can only be found in a higher region, even because they themselves lie on the extreme limits of nature and life, and in part also pass beyond them. We therefore prefer to follow the more slow but sure course of development pursued by physical science itself, as commenced nearly twenty-five centuries ago by the Greeks. On the whole it began even there with the cognition of man--of his diseases and their cure. The naturalists, indeed, of the present day are in general disposed to laugh at the ideas of nature which were advanced by the first philosophers of Greece, and to despise the hypotheses of water, or air, or fire, as being the essence of all things, which, nevertheless, as the first beginnings of a clearer contemplation and of a higher view of nature, greatly recommend themselves by their extreme simplicity. But however modern observers of nature may be ready to hand these systems over to fancy as so many purely poetical cosmogonies, yet, on the other hand, the present masters of medicine, with greater gratitude and fuller acknowledgment of his merits, reverence Hippocrates as the founder of their art. For, indeed, as such, and not properly as a science, or at any rate as an art far more than as a science, was medicine regarded by its founder and the great masters who came after him. They looked upon it as the art of the diagnosis and treatment of disease, in which the unerring tact of a practiced and happy judgment is of primary importance, and where the rapid and searching glance of genius into the secret laboratories of life or into the hidden sources of disease is, and ever will be, the principal and most essential point. The mere historical acquaintance with the different forms of diseases and their remedies, with botany, and the anatomy of the human body, with the number and structure of its organs, forms merely the materials, the external sphere of medical practice; while the essential qualification is even this penetrating glance which searches out the inmost secrets of the bodily temperament. But now those who have been most richly gifted with this peculiar gift have ever been the last to believe themselves possessed of a perfect science. And yet, inasmuch as that physical knowledge which, by attaining to a complete understanding of life, shall be able to comprehend and explain the mystery of death would alone