the sentence has no meaning, since during that period "the striking unit" passes through all "intermediate velocities." But if by instantaneously he means _without period_, then the last clause of the sentence is illogical, since instant there evidently means a period. For if it means point, then it contradicts the first clause. There, it is asserted that 4 was "_reduced_" to 2, _i. e._ that at one point the velocity was 4, and at the next point it was 2, and that there was _no time_ between. If 4 was instantaneously reduced to 2, then the velocity 2 was next after the velocity 4, and not coeval with it. Thus it appears that these two clauses which were meant to be synonymous are contradictory. Bearing in mind what we have heretofore learned respecting atoms, we shall not be troubled by the objections to the Newtonian theory which follow. In reply to the question, "What is the constitution of these units?" the answer, "We have no alternative but to regard each of them as a small piece of matter," would be true if the Sense was the only faculty which could examine them. But even upon this theory Mr. Spencer's remarks "respecting the parts of which each atom consists," are entirely out of place; for the hypothesis that it is an ultimate atom excludes the supposition of "parts," since that phrase has no meaning except it refers to a final, indivisible, material unit. All that the Sense could say, would be, "What this atom is I know not, but that it is, and _is not divisible_, I believe." But when we see by the Reason that the ultimate atom, when dissolved, becomes God's power, all difficulty in the question vanishes. Having thus answered the above objections, it is unnecessary to notice the similar ones raised against Boscovich's theory, which is a modification of that of Newton.