"A dynamo-electric machine is placed at any given spot; its object, being put in action, is to withdraw from the earth its neutral electricity, to decompose it into its two conditions and to collect, upon accumulators, the electricity thus separated. As soon as the accumulators are charged, the electricity is disposable; that is, our lamps can be lighted. But what is marvellous in all this is that the forces of nature can be transformed at will. Should we not wish for light, we turn a knob and we have sound, heat, motion, chemical action, magnetism. Little seems wanting to create intelligence, so entirely do these accumulated forces lend themselves to all the transformations which their engineer may imagine and desire. But let us consider how greatly superior is our cerebral mechanism to all invented mechanism. In order to light a theatre we require a wide space, a dynamo-electric machine of many horse-power, accumulators filling many receptacles, a considerable expense in fuel, and clever mechanicians. In the human organism these engines are in miniature, one décimêtre cube is all the space occupied by our brain; no wheels, no pistons, nothing to drive the apparatus, we suffice ourselves. In this sense, each of us can say, like the philosopher Biaz:--Omnia mecum porto. Our cerebral organ not only originates motion, heat, sound, light, chemical actions, magnetism; but it produces psychic forces, such as will, reasoning, judgment, hatred, love, and the whole series of intellectual faculties. They are all derived from the same source, and are always identical to each other, so long as the cerebral apparatus remains intact. The variations of our health alone are capable of causing a variation in the intensity and quality of our productions. "With a maximum of physical and moral health, we produce a maximum of physical and moral results. Our manual labour and our intellectual productions are always exactly proportionate to the integrity of our mechanism." Dr. Gérard has, it will be seen, grasped the same truth that Buckle enunciated in his lecture, The Influence of Women on the Progress of Knowledge, when he affirmed that not one single discovery that had ever been made has been connected with the laws of the mind that made it: declaring that until this connection is ascertained our knowledge has no sure basis, as "the laws of nature have their sole seat, origin, and function in the human mind." This is the foundation stone of vibratory physics, that all force is mind force.