This last is the receptacle of food. It lives on earthly food; and if it is starved of that it dies, for it is made of earth, it lives on earth. Another is the receptacle of ether. That part of man's being lives by breath and by taking in the air. If it is starved of air it cannot live. These two bodies form the material part, the physical part, of man's being. And it is these two receptacles which are termed in the legend the sons-in-law.