All this was very obvious in the several public experiments, where the drawing of lessons, and the application of them by the pupils, were introduced.--In the case of the adult prisoners in Edinburgh County Jail, it was very observable; and the rolling of the eye, and the unconscious movement of the head, as if deeply engaged in some mental research when an application was required, were peculiarly pleasing and obvious to all the spectators. The reason was, that they had to keep before their mind, the circumstance, or statement involved in the question asked, while they had, at the same time, to review the several portions of their knowledge, chuse out the passage or example which was calculated to direct them in the duty; and then, still keeping these accumulated ideas present before the mind, they had to prepare and give expression to their answers. The same thing had to be done, but to a much greater extent, by the children in Aberdeen, in London, and in Newry. But the most satisfactory evidence of the beneficial working of this principle, in the drawing and applying of lessons, and by this means in giving even to children a command of language, and a power of extemporaneous speech which is but rarely attained even by adults, is to be found in the Seventh Experiment in Leith. The writer feels more at liberty in descanting upon the extraordinary results of that investigation with the children, because he had no share in their previous instruction; the peculiar merits of which belonged entirely to their zealous and pious teacher. He was a plain unlettered man; and yet he has trained hundreds of children in his Sunday school, whose intellectual attainments, for their age and rank in life, the writer has seldom known to be surpassed. There were exhibited by the children, from the beginning of the experiment to the end, an amount of knowledge, a degree of mental culture, a grasp of mind, and a fluency of expression, which had never before been witnessed in children of a similar class, or of the same age, by any person then present. The pupils were at the time quite unprepared for any extraordinary exhibition;--the subjects were chosen indiscriminately by the clergymen present, and were repeatedly changed;--and what is still more extraordinary, it was found, upon investigation, that the subjects were in general entirely new, or at least they had never been previously used as exercises in the school. The children, however, with all these disadvantages, were perfectly at home in each one of them. There appeared to be no exhausting of their resources; and the ease, and copiousness, and fluency of their language, were remarked by all present, as extraordinary, and by some as almost incredible. Many who were present, could scarcely believe that the children spoke extemporaneously. All these phenomena were simply the effects of the principle of which we are here speaking, regularly