We must, indeed, acknowledge that no consciousness, save, of course, the very first, can exist in perfect isolation totally unaffected by any other. The second conscious activity was not a perfect facsimile of the first, and its variation is due at least in the main to the precedent mentality. What is, is determined by what has been, and this universal law is in mind the inductive nature of all experience. The solidarity of all mentality and of all materiality is a scientific postulate, a principle which we must assume, or deny all scientific investigation. The movement of a molecule in the sun, millions of years since, influences the condition of my body to-day, and the flush of pain in some protozoan millions of years since, has had an infinitesimal share in determining my present state of mind. Yet this fact that every psychosis is what it is by reason of the whole line of previous psychoses, does not lead us to suppose that experience cognizes itself from the beginning, and consciously builds itself up. There is for a long time no consciousness of process of mental integration. The whole universe of mind is the necessary _prius_ of each individual manifestation, yet the particular phenomenon in consciousness does not include a sense of, or reaching out to, these conditioning agencies. No sense of dependence is generated. But we ask, How can one conscious state unconsciously effect or determine another? How can consciousness be affected without consciousness of affection? Yet, difficult as it may appear to set clearly before us the nature of this relation of a consciousness to all the preconsciousness, it is still obvious that the intricate _nexus_ of cause and effect in mind does not need to be known of mind or realized in the individual consciousness, and is not, and cannot be. Every consciousness is the derivative resultant of innumerable pre-consciousnesses, and it goes to the determining and qualifying of innumerable post-consciousnesses, yet it is neither consciousness of the future or the past, though it involves both.