Lest the reader should fail to see in the foregoing what the _great contribution_ to philosophy is, let us look in the _Open Court_ of Chicago, which has a most affectionate partiality for metaphysical mystery. It says this "Best contribution to philosophy" "may be summed up thus," "We can perceive nothing but what we can identify with what was familiar already." If this were true, the babe could never perceive anything, as it begins without any knowledge, and it would be impossible for us to learn anything or acquire any new ideas. This is rather an amusing _discovery_! but it is barely possible or conceivable that there are some old fossils whose minds are in that melancholy condition. P. S. After a few hours of repose to recover from mental fatigue and digest the new wisdom so suddenly let loose upon mankind, we discover the new aspect of the world of (Concord) philosophy. The great question of the future will be to syllogize or not to syllogize. Is it possible to distinguish an elephant from a tin can by any other method than the syllogism? When that question is decisively settled, if it ever can be settled (for metaphysical questions generally last through the centuries) Prof. Harris will have an opportunity to win still brighter laurels, and make still greater contributions to philosophy, by finding more syllogisms. Will he not prove that mathematics is the sphere of syllogism also, for if two and two make four, does not the conception of four assume the position of the major predicate, which is the generalized idea of one to a quadruple extent, and also of twos duplicated. Thus the major predicate, that four is two twos, involves the minor that two is the half of four and consequently that twice two is four. Q. E. D. The syllogism is irresistible. If Prof. Harris should establish the mathematical syllogism and extend its power through all the realms of mathematics, as so industrious a thinker might easily do, he will have taken a step far in advance of Plato, and justly deserve a higher rank, for Plato (see his Phædo) was terribly puzzled over the question how one and one make two. After much puzzling he decided finally that one and one became two "by _participation in duality_." This was the first great step to introduce philosophy into mathematics. Let Prof. Harris consummate this great work either by syllogism or by "_participation_."