" If it is day, it is light." An inferential proposition according to Crinis in his Art of Dialectic is one which is introduced by the conjunction " Since " and consists of an initial proposition and a conclusion ; for example, " Since it is day-time, it is light." This conjunction guarantees both that the second thing follows from the first and that the first is really a fact. A coupled proposition is one which is put together by certain coupling conjunctions, e.g. "It is day-time and it is light." A disjunctive proposition is one which is constituted such by the disjunctive conjunction " Either," as e.g. " Either it is day or it is night." This conjunction guarantees that one or other of the alternatives is false. A causal proposition is constructed by means of the conjunction " Because," e.g. "Because it is day, it is light." For the first clause is, as it were, the cause of the second. A proposition which indicates more or less is one that is formed by the word signifying " rather " and the word " than " in between the clauses, as, for example, "It is rather day-time than night." Opposite in character to the foregoing is a proposition which declares what is less the fact, as e.g. " It is less or not so much night as day." Further, among propositions there are some which in respect of truth and falsehood stand opposed to one another, of which the one is the negative of the other, as e.g. the propositions "It is day " and " It is not day." A hypothetical proposition is therefore true, if the contradictory of its conclusion is incompatible with its premiss, e.g. " If it is day, it is light." This is true. For the statement " It is not light," contradicting the conclusion, is incompatible witli the premiss "It is day." On the other hand, a hypo-