210. _Objection Eighth, (Scientific)._—Your doctrine of immortality does violence to that great principle, the conservation of energy. For it is manifest that if energy is transferred from the visible into the invisible universe, its constancy in the present universe can no longer be maintained. _Reply._—In reply to this objection we may state that when we assert the conservation of energy it is as a principle applicable under special limitations. For instance, it is only by assuming the continual passage through ether of a large portion of the energy of the visible universe that the doctrine as at present held can be maintained. Now the only addition that our theory suggests is the gradual carriage into the invisible universe of some part at least of the energy of gross matter which is associated with thought. But is even this necessary? for this supposes thought to originate through the matter of the visible universe, and then to affect the invisible. But the reverse order of occurrences is quite as tenable, especially if we suppose with Le Sage that the forces which set in motion the molecules of visible matter are derived from the unseen universe. It may safely be said that our hypothesis is not upset, and never can be upset, by any experimental conclusion with regard to energy. 211. _Objection Ninth (Scientific)._—We cannot understand how individuality is to be preserved in the spiritual world. _Reply._—This is no new difficulty. We are as much puzzled by what takes place in our present body as we can be with respect to the spiritual. Thus, let us allow that impressions are stored up in our brains, which thus form an order connecting us with the past of the visible universe. Now thousands, perhaps even millions, of such impressions pass into the same organ, and yet, by the operation of our will, we can concentrate our recollection upon a certain event, and rummage out its details, along with all its collateral circumstances, to the exclusion of everything else. But if the brain or something else plays such a wonderful part in the present economy, is it impossible to imagine that the universe of the future may have even greater individualising powers? Is it not very hazardous to assert this or that mode of existence to be impossible in such a wonderful whole as we feel sure the universe must be? 212. _Objection Tenth (Scientific)._—Even if it be allowed that the invisible universe receives energy from the present, so that the conservation of energy holds true as a principle, yet the dissipation of energy must hold true also, and although the process of decay may be delayed by the storing up of energy in the invisible universe, it cannot be permanently arrested. Ultimately we must believe that every part of the whole universe will be equally supplied with energy, and in consequence all abrupt living motion will come to an end.