We have a concept of the Universe as a vast system in the form of a sphere in which all things are included. This spherical system is complete, definite, limited, and so has boundaries. A portion of "immeasurable void"--Space--has been occupied. Where there was nothing, something has become. Now it is evident that the possibility of our having a concept of the Universe, or of a space and a time in the Universe, is based upon the presence of an actual, underlying, all-pervading substance, which fills and forms the boundaries of the Universe, and thus enables spaces and times to be. We have no concept except as in limits, and those limits are conceived to be substance. In other words, space is distance, and time is duration, in our concept. Take away the boundaries which mark the distance, and the procession of events which forms the duration, and in the concept pure negation is left. To illustrate. Suppose there be in our presence a cubic yard of vacuum. Is this vacuum an entity? Not at all. It can neither be perceived by the Sense nor conceived by the Understanding. Yet it is a space. Speaking carelessly, we should say that this cube was object to us. Why? Because it is enclosed by substantial boundaries. All, then, that is object, all that is entity, is substance. In our concept, therefore, a space is solid distance within the substance, and the totality of all distances in the Universe is conceived to be Space. Again; suppose there pass before our mind a procession of events. One event has a fixed recurrence. In our concept the procession of events is a time, and the recurring event marks a period in time. The events proceeding are all that there is in the concept; and apart from the procession a conception of time is impossible. The procession of all the events of the Universe, that is _duration_, is our concept of Time. Thus, within the Universe, space is solid distance and time is duration; and neither has any actuality except as the Universe is. Let us assume for a moment that our concept is the final truth, and observe the result. In that concept space is limited by matter, and matter is conceived of as unlimited. This result is natural and necessary, because matter, substance, "a space-filling force," is the underlying notional upon which as ground any concept is possible. If matter is truly illimitable, then materialistic pantheism, which is really atheism, logically follows. Again; in our concept time is duration, and duration is conceived of as unlimited. If so, the during event is unlimited. From this hypothesis idealistic pantheism logically follows. But bring our concept into the clear light, and under the searching eye of Reason, and all ground for those systems vanishes instantly. Instead of finding matter illimitable and the limit for a space, Space is seen to be illimitable and pure condition, that matter may establish a limit within it. And Time, instead of being duration, and so limited by the during