Among the greatest discoveries of the present century is the fact that Idiots may be redeemed, from their sorrowing night of ignorance and degradation, to enjoy the light of knowledge, and become co-laborers with their more favored fellow-men, in the productive interests of our social and Christian civilization. This fact is demonstrated in the little volume before us; and the means that are employed for its accomplishment, are also described. In perusing it, I have been forcibly struck with the simple eloquence of the imperfect words and broken sentences, of the poor children who are noticed, and with the valuable lessons which they teach.