Matter and Force into terms of Mind than _vice versa_. And this is true, but it does not therefore follow that the truth is more likely to lie in the direction that thought can most easily travel. For although I am at one with Mr. Spencer, whom Mr. Fiske follows, in regarding his test of truth--viz., inconceivability of a negation--as the most _ultimate_ test within our reach, I cannot agree with him that in this particular case it is the most _trustworthy_ test within our reach. I cannot do so because the reflection is forced upon me that, "as the terms which are contemplated in this particular case are respectively the highest abstractions of objective and of subjective existence, the test of truth in question is neutralised by directly encountering the inconceivable relation that exists between subject and object." Or, in other words, as before stated, "_whatever_ the cause of Mind may be, we can clearly perceive it to be a subjective necessity of the case that, in ultimate analysis, we should find it more easy to conceive of this cause as resembling Mind--the only entity of which we are directly conscious--than to conceive of it as any other entity of which we are only indirectly conscious." When, therefore, Mr. Spencer argues that "it is impossible to interpret inner existence in terms of outer existence," while it is not so impossible to interpret outer existence in terms of inner existence, the fact is merely what we should in any case expect _a priori_ to be the fact, and therefore as a fact it is not a very surprising discovery _a posteriori_. So that when Mr. Fiske proceeds to make this fact the basis of his argument, that because we can more conceivably regard objective existence as like in kind to subjective existence than conversely, therefore we should conclude that there is a corresponding probability in favour of the more conceivable proposition, I demur to his argument. For, fully accepting the fact on which the argument rests, and it seems to me, in view of what I have said, that the latter assigns an altogether disproportionate value to the test of inconceivability in this case. Far from endowing this test with so great an authority in this case, I should regard it not only as perceptibly of very small validity, but, as I have said, invalid to a degree which we have no means of ascertaining. If it be asked, What other gauge of probability can we have in this matter other than such a direct appeal to consciousness? I answer, that this appeal being here _a priori_ invalid, we are left to fall back upon the formal probability which is established by an application of scientific canons to objective phenomena. (See footnote in Sec. 14.) For, be it carefully observed, Mr. Spencer, and his disciple Mr. Fiske, are not idealists. Were this the case, of course the test of an immediate appeal to consciousness would be to them the only test available. But, on the contrary, as all the world knows, Mr. Spencer asserts the existence of an