In the first place, if we see what is at the back of all medicines that are used for healing purposes, and if we ask what it is in them that heals, we shall find that it is the different elements which constitute our physical existence. The same elements are present in these medicines, and that which is lacking in us is taken from them, or that effect which should be produced in our body is produced by them. That vibration which is to be created in the body is created by their power, and that rhythm which is necessary for our cure is brought about by putting the circulation of the blood into a certain rhythm and speed. The intensity of vibration which may be necessary for our health is brought about by the medicines.