The methods by which natural philosophy ought to be taught in schools, must partake of all the laws which Nature employs in the several parts of her teaching. Individuation, Grouping, and especially Analysis, must be rigidly attended to. By dividing all the subjects of general knowledge into the two grand divisions of Terrestrial and Celestial, and these again into their several parts, the whole field of useful knowledge would be mapped out, and connected together, so that each subject would occupy a distinct place of its own, and be readily found when it was required. The facts, or at least the most useful facts connected with each of these, would very soon be communicated; and when turned into a popular and useful form, by drawing and applying the corresponding lessons, the ease and delight of laying up these precious stores of useful knowledge by children, will not be easily conceived by those who have not witnessed it.

With respect to the ease with which this method of communicating knowledge can be accomplished, we may remark in general, that when a principle has been explained, and has become familiar to the child, all the phenomena arising out of it, when pointed out, are readily perceived and retained upon the memory in connection with it. For example, by a knowledge of the principle which teaches that fluids press equally on all sides, when considered in connection with the weight of the atmosphere, a child, with very little trouble, would be put into the full possession of the cause of many facts in natural philosophy, exceedingly dissimilar in their appearance, but which are all mastered with ease and intelligence by a knowledge of this law. When the principle and its mode of working have been explained, the child is provided with a key, by which he may, in the exercise of his own powers, unlock one by one all the mysterious phenomena of the air and common pump, the cupping-glass, the barometer, the old steam and fire engine, the toy sucker and pop-gun, the walking of a fly on the ceiling, the ascent of smoke in the chimney, the sipping of tea from a cup, the sucking of a wound, and the true cause of the inspiration and expiration of the air in breathing. To teach these singly, would obviously be exceedingly troublesome to the teacher, and laborious for the child; but when thus linked together, as similar effects from the same cause, they are understood at once, and each of them helps to illustrate and explain all the others. They are received without confusion, and are remembered without difficulty. All this may in general be done even with children, as we shall immediately prove, by the method recommended above, of requiring, after the illustration of the principle, the lessons which it is calculated to teach.

The results of this simple method of imitating Nature in one of the most valuable of her processes, have been found remarkably uniform and successful; and when it shall be regularly brought into operation in connection with the other parts of the system, it promises to be still more valuable and extensive. But even already, with all the disadvantages of time, place, and persons, the importance and efficiency of the exercise have been highly satisfactory. We shall shortly advert to a few instances of its success, which have been publicly exhibited and recorded.

The criminals in the jail of Edinburgh, after three weeks teaching, had acquired a considerable degree of expertness in perceiving and drawing lessons from the moral circumstances which they read from Scripture. In the report of that experiment, the examinators say, "They gave a distinct account, (from the book of Genesis,) of the prominent facts, from Adam, down to the settlement in Goshen, and shewed by their answers, that the circumstances were understood by them, in their proper nature and bearings. From each peculiar circumstance, they deduced an appropriate lesson, calculated to guide their conduct, when placed in a like, or analogous situation. It is within the truth to allege, that in this part of their examination, they submitted upwards of fifty palpable lessons, that cannot fail, we would conceive, hereafter to have a powerful influence upon their affections and deportment."

In the experiments both in Newry and London, the children were found quite adequate to the exercise; and in the latter instance, three children, who at their first lesson did not know they had a soul, were able to perceive and to draw lessons from almost any moral truth or fact presented to them. This they did repeatedly when publicly examined by the Committee of the London Sunday School Union, in presence of a large body of clergymen, and a numerous congregation in the Poultry Chapel. But we shall at present direct attention more particularly to the children selected from the several schools in Aberdeen, as given in the Report by Principal Jack, and the Professors and Clergymen in that place. After mentioning, that these children, so very ignorant only eight days before, had acquired a thorough acquaintance with the leading facts in Old Testament History, they say, "From the various incidents in the Sacred Record, with which they had thus been brought so closely into contact, they drew, as they proceeded, a variety of practical lessons, evincing, that they clearly perceived, not only the nature and qualities of the actions, whether good or evil, of the persons there set before them, but the use that ought to be made of such descriptions of character, as examples or warnings, intended for application to the ordinary business of life.

"They were next examined, in the same way, on several sections of the New Testament, from which they had also learned to point out the practical lessons, so important and necessary for the regulation of the heart and life. The Meeting, as well as this Committee, were surprised at the minute and accurate acquaintance which they displayed with the multiplicity of objects presented to them,—at the great extent of the record over which they had travelled,—and at the facility with which they seemed to draw useful lessons from almost every occurrence mentioned in the passages which they had read."

They were able also to apply this same principle,—the practical application of useful knowledge,—to the perusal of civil history, and also biography. The report states, that "they were examined on that portion of the History of England, embraced by the reign of Charles I. and the Commonwealth; and from the details of this period, they drew from the same circumstances, or announcements, political, domestic, and personal lessons, as these applied to a nation, to a family, and to individuals;—lessons which it ought be the leading design of history to furnish, though, both by the writers and readers of history, this Committee are sorry to say, they are too generally overlooked.

"They were then examined on biography,—the Life of the late Rev. John Newton being chosen for that purpose; from whose history they also drew some very useful practical lessons, and seemed very desirous of enlarging, but had to be restrained, as the time would not permit."

The practicability and the importance of teaching children to apply the same valuable principle to every branch and portion of natural philosophy were also ascertained. The same report, after stating the fact, that the children scientifically described to the meeting numerous objects presented to them from the several kingdoms of Nature, goes on to say, that "here also they found no want of capacity or of materials for practical lessons. A boy, after describing copper as possessing poisonous qualities, and stating, that cooking utensils, as well as money, were made of it, was asked what practical lessons he could draw from these circumstances, replied, That no person should put halfpence in his mouth; and that people should take care to keep clean pans and kettles."

The common school boys in Newry also found no difficulty in the exercise, as applied to the abstruse and difficult sciences of anatomy and physiology. The account of that experiment, says, that they were "examined as to the uses which they ought to make of all this information, by drawing practical lessons from the several truths. Accordingly, announcements from the different branches of the science were given, from which they now very readily drew numerous and valuable practical lessons, several of which were given at this time of themselves, and which had not been previously taught them. These were drawn directly from the announcements; and all, according to their nature, calculated to be exceedingly useful for promoting the health, the comfort, and the general happiness of themselves, their friends, or their companions."