Geology supplies some good sequences. It has been noticed, for instance, that the sea leaves ripple-marks on sandy beaches, and stones with similar marks have been found at a distance from the sea; it is a valid sequential inference that the marks in the latter case have also been formed by the action of the waves. Here the difference in locality between the two compared series--the modern complete and the ancient incomplete--supplies that slight element of doubt essential to an argument. So as regards the mode of making ancient flint tools: it has been found that tools exactly similar to the ancient can now be made with the simplest possible means, and it is a true argument to infer that the ancient implements were made by these means. The conclusion is highly probable without being infallibly certain, and that is what a dialectical conclusion ought to be. We may admit that some of the astronomical sequences are forms of reasoning, for they were such to their first discoverers, and to minds not thoroughly conversant with them they are still in the nature of predictions that might fail of accomplishment. Political, financial, and sporting forecasts are sequential arguments, and we may also include speculations on the future states of all growing organisms and developing institutions. _Time._ The intervals between the objects of a sequence are imagined after the model of lateral intervals in association. This is Time. Like space it is mere blanks in experience, though treated by realists as external and self-subsisting. It can be measured by reference to objects on whose sequential recurrence we have the most reliance, such as the phases of the moon, the positions of the sun in the ecliptic, the movements of the hands of a clock or the chiming of its bells. Abstract or unbounded time is called 'eternity'; like abstract space it is a refined form of nothing. Time and space are usually coupled together as if co-ordinate, but eternity is the co-ordinate of space. Time is divided sequence and would correspond to materially divided space, that is, space with objects in it at regular intervals. Matter, space, and time are the three pillars of the realistic world. We have now seen what they are made of. Matter is a general idea compiled by ourselves from phenomenal consciousness. It is no substance--only an average. Space has even less reality. It is first the interval between two objects in association; then this interval is used metaphorically as an expression and measure of perspective decadence. Time is an application of the same associative interval to express the blanks between objects in sequence. Space and time are thus pure nullities--negatives with positive names. These three notions being exploded as entities, there remain as a residuum of true fact and the starting-point of philosophy--_minds_, their _energies_, and their _consciousness_. This is a very ancient triad.