dogmatic way; but I will give you instead a scientific answer, for you, like myself, accept only as of real value the results of positive knowledge.

We find in the human being three principles, different, and yet in complete union: 1. The body; 2. The vital energy; 3. The soul. I name them thus in order that I may follow the a posteriori method.

The body is an association of molecules which are themselves formed of groups of atoms. The atoms are inert, passive, immutable, and indestructible. They enter into the organism by means of respiration and alimentation; they renew the tissues incessantly, and are continually replaced by others, and when cast out from the body go to form other bodies. In a few months the human body is entirely renewed, and neither in the blood, nor in the flesh, nor in the brain, nor in the bones, does an atom remain of those which constituted the body a few months before. The atoms travel without ceasing from body to body, chiefly by the grand medium of the atmosphere. The molecule of iron is the same whether it be incorporated in the blood which throbs in the temples of an illustrious man, or forms part of a fragment of rusty iron; the molecule of oxygen is the same in the blush raised by a loving glance, or when in union with hydrogen it forms the flame of one of the thousand jets of gas that illuminate Paris by night, or when it falls from the clouds in the shape of a drop of water. The bodies of the living are formed of the ashes of the dead, and if all the dead were to be resuscitated, the last comers might find the material for their bodies wanting, owing to their predecessors having appropriated all that was available. Moreover, during life many exchanges are made between enemies and friends, between men, animals, and plants, which amaze the analyst who looks at them with the eyes of science. That which you breathe, eat, and drink, has been breathed, drunk, and eaten millions of times before. Such is the human body, an assemblage of molecules of matter which are constantly being renewed. The principle by which these molecules are grouped according to a certain form so as to produce an organism, is the vital energy of life. The inert, passive atoms, incapable of guiding themselves, are ruled by vital force, which calls them, makes them come, takes hold of them, places and disposes of them according to certain laws, and forms this marvellously-organised body, which the anatomist and the physiologist contemplate with wonder.

The atoms are indestructible; vital force is not: atoms have no age; vital force is born, grows old, and dies. Why is an octogenarian older than a youth 

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