This class includes all internal diseases originating from disorders arising among the interaction of the physiological functions of the organs of the body, or of the interaction between these and those of the soul (the emotions) and mind (thoughts). This system of Paracelsus includes the whole realm of modern physiology and pathology; but it penetrates deeper, for it investigates the functions of soul and mind, and follows the development of an evil desire or thought until it ultimately finds its expression in an external manifestation of visible pathological states. To enter into the details of this field of pathology is not possible within the limits of this book. There is no indication that the sympathies and antipathies, in other words the physiological relations existing between the different organs in the human body, are better known at the present time than they were at the time of Paracelsus: on the contrary, he speaks of the currents of the life-principle taking place between these organs, while modern anatomy speaks only of nerves, which are in regard to the “life-fluid” what electric wires are in regard to electricity. “The heart sends its spirit (will power) through the whole of the body, as the sun his power to all the planets and earths; the {symbol} (the intelligence of the brain) goes to the heart and back again to the brain. The fire (heat) takes its origin in the (chemical) activity of the organs (the lungs), but pervades the whole body. The _liquor vitæ_ (essence of life) is universally distributed and moves (circulates) in the body. This ‘humor’ contains many different powers, and cause in him ‘metals’ (virtues or vices) of various kinds.” (“Paramirum,” L. I. Tr. 3.) In regard to this subject modern medical science says:— “A wide basis of positive knowledge in regard to this subject does not exist. The physiology of the different departments of the sympathetic system of nerves is now only beginning to shape itself, while on the side of pathology and morbid anatomy there is even still less of definite knowledge. Thus it happens that for the most part only conjectures, often very insecurely based are current, or can be said to exist in regard to the dependence of definite sets of symptoms, or distinct diseases, upon disordered actions or morbid changes occurring in one or other part of the sympathetic system of nerves.” (“H. Charlton Bastian.”)