A very clever _jeu d'esprit_ went the rounds of the periodical press some time ago, in which a well-born and highly educated young agnostic was represented as losing his birthright, his _fiancée_, and all his prospects in life, because he demanded rigorous proof of everything that affected him. As he would not admit that he was the son of his own parents, without having better proof of it than their assertion, he was turned out-of-doors and disinherited. He would not accept the bloom on the cheek of his mistress as natural unless she gave him her word that she did not paint; and he would not admit that they loved each other without some better proof than their mutual feelings, about which they might be mistaken. The young lady indignantly dismissed him, but he consoled himself as a martyr to the truth of agnosticism. He became tutor to the son of a nobleman, whose belief in the boy's extraordinary talents, although justified by his progress in his studies, the tutor would not admit had the requisite proof. He propounded his denial of what the father had no proper grounds for maintaining, in an offensive way, and of course he lost his place. He retired to a sort of agnostic brotherhood, glorying in his adhesion to truth. Some of his companions remained long enough in the brotherhood to find out that they were making fools of themselves, and at the first opportunity for acting on the ordinary grounds of knowing a fact without rigorous demonstration of it they left him in solitude, went into the world, and achieved success. "A man shall not say he knows or believes that which he has no scientific grounds for professing to know or believe." By "scientific grounds," I presume is meant, in the case of a fact or occurrence, proper proof of the fact or occurrence. This varies with the nature of the thing which one professes to know. We constantly act upon proofs which do not amount to demonstration, and there could be no practical enjoyment of our lives and no safety if we did not. If a government were to receive information that a foreign army was on the border of the country and about to invade it, and the information fell short of being the testimony of eye-witnesses, what would be thought of the rulers if they were to fold their hands and say that they did not know the fact because they had no "scientific grounds for professing to know it"? On the other hand, if in a court of justice the question to be determined were the presence of an individual at a certain place and at a certain time, the established rules of evidence require certain kinds of proof of the fact.