Excerpt from Key to Natural Philosophy
This Key is written for the convenience of teachers, - to save them the time necessary to work out all the Exercises of the Philosophy. It will assist them also in determining which of these Exercises to omit. While all of them will be useful for a class of good or well-developed students, it is undesirable to exact them all of the weaker ones: in general, the authors think it unwise to require any which the average member of the class cannot work out for himself, at least with a few hints from the teacher. Properly used, anything which requires original thinking of the students is the most beneficial part of a treatise; but examples too difficult, which have to be fully explained by the teacher, have no especial value.
We think these considerations will be a guide to the teacher in the selection of the exercises which he assigns to his students.
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