Of increasing importance in our educational system are what are termed " correspondence schools." In certain lines, their great value is unquestioned. To the young man deprived of a high or technical school education they provide an opportunity for acquiring theoretical instruction that could not otherwise be obtained. But, like anything else, there are limitations to the benefits that can be derived from this method of education. The theoretical character of the instruction should be remembered by those contemplating a course of study, and, where actual experience and experiment are necessary to a proper knowledge of a subject, a way should be provided to secure it as supplemental to the instruction. The value that such instruction would then have is limited only by the ability of the student.

Care should also be exercised in the selection of the course of study, and advanced or highly technical instruction should not be applied for when the more appropriate and beneficial course would be elementary arithmetic and English. The foundation should be adequate to support the superstructure. A course in civil engineering will be of small value to the man who knows but little of mathematics. To the apprentice in shop or •factory who can practically apply the instruction given, such study is valuable and should be warmly encouraged by employers. To the clerk in the office a mechanical course might be useful in giving an insight into the work, but would never make him a mechanic. He would profit more from a course in mathematics or language. All the circumstances should be carefully considered and the course of instruction selected should be appropriate to the present condition and future needs of the student.

The first electric motor was the pendulum of the electric, chimes made by Otto von Guericke in 1632.