_Reply to the first Argument._--To these arguments I reply, in the first place, that it is not necessary that a cause should be in actual operation, under our immediate eye, in order that we should conclude its independent and constant existence. If, whenever the occasion returns, the effects are observed, we conclude that the cause exists _per se_, and not merely in relation to us. Otherwise we could never believe the absolute existence of any thing, but should, with Berkley and Hume, call in question the existence of matter itself, save as phenomenal and relative to our senses. The same argument that makes the beauty of a rose relative merely to the observer, makes the rose itself merely a relative existence. How do I know that it exists? I see it, feel it, smell it; it lies upon my table; it affects my senses. I turn away now. I leave the room. How do I know _now_ that the rose exists? It no longer affects my senses; the cause no longer operates; the effect is no longer produced. I have just as much reason to say it no longer exists, as to say it is no longer beautiful. _Reply to the second Argument._--To the argument from the diversity of effect, I reply, that admitting the fact to be as stated, viz., that the same object is differently regarded by different minds, the diversity may arise from either of two sources. The want of uniformity may lie in the cause, or it may lie in the minds affected by it. The exciting cause may vary, and the effects produced by it will then be diverse; or the minds on which it operates may differ, and in that case, also, the effects will be diverse. We are not to conclude, then, from diversity of effect that the cause is not uniform. A beautiful object, it is true, affects different observers differently, but the reason of the diversity may be in _them_ and not in the object. What then is the fact? Are the minds of all observers equally susceptible of impression from the beautiful? By no means. They differ in education, habit of thought, culture, taste, native sensibility, and many other things. Hardly two minds can be found that are not diverse in these respects. Ought we then to expect absolute uniformity of effect?