We are glad to notice that in many of the leading colleges of America there is a growing opposition to the introduction of co-education, to the trial of an experiment that has failed, failed most dismally in almost every instance. The American people are so fond of novelty and so anxious to "give everything a fair show," that it seemed for a while as if this feeble fancy would be supplied with enough vitality to force for itself a position from which it would have been difficult, or even impossible to remove it. But the recent sensible and far-sighted conduct of many institutions of learning, and Harvard is among them, in refusing to open its doors to women, has convinced us that for some years, at least, co-education will be an unrealized dream, as far as some colleges are concerned.