“godliness is profitable” not only “unto all things,” but also, as mediæval writers were wont to say, unto some things besides, which the apostle Paul in his admonitions to his “son Timothy” never dreamed of. We are also told that the _aura corrumpens_ resulting from diabolical infestation imparts to the dwelling a peculiar taint, which it often retains for a long time after the demons have been cast out, so that sensitive persons cannot enter such a domicile without getting nervously excited, slightly dizzy and all in a tremble. The carnal mind, which is at enmity with all supernatural explanations of natural phenomena, would seek the source of such sensations in an _aura corrumpens_ arising from the lack of proper ventilation, and find relief by simply opening the windows instead of calling in a priest with aspergills, and censers, and _benedictiones locorum_. We have a striking illustration of this truth in the frequent cases of “bewitched kine.” European peasants often confine their cattle in stalls so small and low that the beasts have not sufficient air to breathe. The result is that a short time after the stalls are closed for the night the cattle get excited and begin to fret and fume and stamp, and are found in the morning weak and exhausted and covered with sweat. The peasant attributes these phenomena to witchcraft, and calls in an exorcist, who proceeds to expel the evil spirits. Before performing the ceremony of conjuration, he opens the doors and windows and the admission of fresh air makes it quite easy to cast out the demons. A German veterinarian, who reports several instances of this kind, tried in vain to convince the peasants that the trouble was due, not to sorcery, but to the absence of proper sanatory conditions, and finally, in despair of accomplishing his purpose in any other way, told them that if the windows were left open so that the witches could go in and out freely, the demons would not enter into the cattle. This advice was followed and the malign influence ceased.