Whatever we may think of the value of this theory, it cannot be denied that the effect which certain physical processes going on in the atmosphere have on our body and mind alike is very striking and yet almost entirely unknown. Science is leisurely gathering up facts which will no doubt in the end furnish us a clue to many phenomena which we now call magic, or even supernatural. Thus almost every hour of the day has its peculiarity in connection with Nature: at one hour the barometer, at another the thermometer reaches its maximum; at other periods magnetism is at its highest or the air fullest of vapor, and to these various influences the diseases of men stand in close relation. When Auroras are seen frequently the atmosphere is found to be surcharged with electricity; they are intimately connected with gastric fevers, and according to some physicians, even with typhus and cholera. It has also been ascertained that the progress of the cholera and the plague--perhaps also of common influenza--coincides accurately with the isogonic line; these diseases disappear as soon as the eastward declination of the magnetic needle ceases. In recent times a correspondence of the spots in the sun with earth-magnetism has also been observed. In like manner it has been established that continued positive electricity of the air, producing ozone in abundance, is apt to cause catarrhs, inflammations, and rheumatism, while negative electricity causes nervous fevers and cholera. Even the moon has recovered some of its former importance in its relations to the human body, and although the superstitions of past ages with their absurd exaggerations have long since been abandoned, certain facts remain as evidences of a connection between the moon and some diseases. Thus the paroxysms of lunatics, epileptics, and somnambulists are undoubtedly in correspondence with the phases of the moon; madmen rave most furiously when the latter is full, and its phases determine with astonishing regularity the peculiar affections of women, as was triumphantly proven by the journal kept with admirable fidelity during the long life of Dr. Constantine Hering of Philadelphia.