Mr. Ingersoll is not, as some have estimated him, the most formidable enemy that Christianity has encountered since the time of Julian the Apostate. But he stands at the head of living infidels, "by merit raised to that bad eminence." His mental organization has the peculiar defects which fit him for such a place. He is all imagination and no discretion. He rises sometimes into a region of wild poetry, where he can color everything to suit himself. His motto well expresses the character of his argumentation--"mountains are as unstable as clouds:" a fancy is as good as a fact, and a high-sounding period is rather better than a logical demonstration. His inordinate self-confidence makes him at once ferocious and fearless. He was a practical politician before he "took the stump" against Christianity, and at all times he has proved his capacity to "split the ears of the groundlings," and make the unskillful laugh. The article before us is the least objectionable of all his productions. Its style is higher, and better suited to the weight of the theme. Here the violence of his fierce invective is moderated; his scurrility gives place to an attempt at sophistry less shocking if not more true; and his coarse jokes are either excluded altogether, or else veiled in the decent obscurity of general terms. Such a paper from such a man, at a time like the present, is not wholly unworthy of a grave contradiction. He makes certain charges which we answer by an explicit denial, and thus an issue is made, upon which, as a pleader would say, we "put ourselves upon the country." He avers that a certain "something called Christianity" is a false faith imposed on the world without evidence; that the facts it pretends to rest on are mere inventions; that its doctrines are pernicious; that its requirements are unreasonable, and that its sanctions are cruel. I deny all this, and assert, on the contrary, that its doctrines are divinely revealed; its fundamental facts incontestably proved; its morality perfectly free from all taint of error, and its influence most beneficent upon society in general, and upon all individuals who accept it and make it their rule of action. How shall this be determined? Not by what we call divine revelation, for that would be begging the question; not by sentiment, taste, or temper, for these are as likely to be false as true; but by inductive reasoning from evidence, of which the value is to be measured according to those rules of logic which enlightened and just men everywhere have adopted to guide them in the search for truth. We can appeal only to that rational love of justice, and that detestation of falsehood, which fair-minded persons of good intelligence bring to the consideration of other important subjects when it becomes their duty to decide upon them. In short, I want a decision upon sound judicial principles.