Again, a clearly defined distinction may be made between them as conditions. Space is the _a priori_ condition of _material_ being. Should a spiritual person, as the soul of a man, be stripped of all its material appurtenances, and left to exist as pure spirit, it could hold no communication with any other being but God; and no other being but he could hold any communication with it. It would exist out of all relation to Space. Not so, however, with Time. Time is the _a priori_ condition of all created being, of the spiritual as well as material. In the case just alluded to, the isolated spiritual person would have a consciousness of succession and duration, although he would have no standard by which to measure that duration, he could think in processes, and only in processes, and thus would be necessarily related to Time. Dr. Hickok has expressed this thus: "Space in reference to time has no significancy. Time is the pure form for phenomena as given in the internal sense only, and in these there can be only succession. The inner phenomenon may endure in time, but can have neither length, breadth, nor thickness in space. A thought, or other mental phenomenon, may fill a period, but cannot have superficial or solid content; it may be before or after another, but not above or below it, nor with any outer or inner side."--_Rational Psychology_, p. 135. Space and Time may also be distinguished thus: "Space has three dimensions," or, rather, there can be three dimensions in space,--length, breadth, and thickness. In other words, it is solid room. "Time has but one dimension," or, rather, but one dimension can enter into Time,--length. In Time there can only be procession. Space and Time may then be called, the one "statical," the other "dynamical," illimitation. Following the essayist already referred to, they may be defined as follows: "Space is the infinite and indivisible Receptacle of Matter. "Time is the infinite and indivisible Receptacle of Existence." Both, then, are marked by receptivity, indivisibility, and illimitability. The one is receptivity, that material object may come into it; the other, that event may occur in it. There is for neither a final unit nor any limit. All objects are divisible in Space, and all periods in Time; and thus also are all limits comprehended, but they are without limit. Turning now from these more general aspects of the subject, a detailed examination may be conducted as follows. The fundamental law given by the Reason is, as was seen above, that Space and Time are _a priori_ conditions of created being. We can best consider this law in its application to the facts, by observing two general divisions, with two sub-divisions under each. Space and Time have, then, two general phases, one within, and one without, the mind. Each of these has two special phases. The former, one in the Sense, and one in the Understanding. The latter, one within, and one without, the Universe.