(4) He speaks of "a series of apparent fluids (as Light or its vehicle, the Calorific, the Electro-galvanic, and Magnetic agents) which we can neither denude of their character of substance, nor clothe with the attribute of weight." To which my reply is, that precisely because I cannot "clothe" these agents with the attribute of Weight, I _do_ "denude them of the character of Substance." They are not substances, but agencies. These Imponderable Agents are not properly called "Imponderable Fluids." This I conceive that I have proved; and the proof is not shaken by denying the conclusion without showing any defect in the reasoning. (5) Finally, my critic speaks about "a logical canon," and about "a criterion of truth, subjectively necessary and objectively certain;" which matters I shall not waste the reader's time by discussing. FOOTNOTES: [Footnote 303: B. iv. c. i.] [Footnote 304: Reid's _Works_, Supplementary Dissertation D.] [Footnote 305: _Hist. Sc. Id._ b. iii.] [Footnote 306: _Hist. Sc. Id._ b. vi. c. iii.] CHAPTER XXVIII. INFLUENCE OF GERMAN SYSTEMS OF PHILOSOPHY IN BRITAIN. The philosophy of Kant, as I have already said, involved a definite doctrine on the subject of the Fundamental Antithesis, and a correction of some of the errors of Locke and his successors. It was not however at first favourably received among British philosophers, and those who accepted it were judged somewhat capriciously and captiously. I will say a word on these points[307]. 1. (_Stewart_)--Dugald Stewart, in his _Dissertation on the Progress of the Moral Sciences_, repeatedly mentions Kant's speculations, and always unfavourably. In Note I to Part I. of the Dissertation he says, "In our own times, Kant and his followers seem to have thought that they had thrown a strong light on the nature of _space_ and also of _time_, when they introduced the word _form_ (_form of the intellect_) as a common term applicable to both. Is not this to revert to the scholastic folly of verbal generalization?" And in Part II. he gives a long and laborious criticism of a portion of Kant's speculations; of which the spirit may be collected from his describing them as resulting in "the metaphysical _conundrum_, that the human mind (considered as a _noumenon_ and not as a _phenomenon_) neither exists in space nor time." And after mentioning Meiners and Herder along with Kant, he adds, "I am ashamed to say that in Great Britain the only one of these names which has been much talked of is Kant." And again in Note EE, he translates some portion of the German philosopher, adding, that to the expressions so employed he can attach no meaning.