It seems to me that it shows very clearly that one ought to teach his pupils, as much as possible, _in masses_, and as little as possible by private attention to individual cases.
The following directions will help the teacher to carry these principles into effect.

When you assign a lesson, glance over it yourself, and consider what difficulties are likely to arise.

You know the progress which your pupils have made, and can easily anticipate their difficulties.

Tell them all together, in the class, what their difficulties will be, and how they may surmount them.

Give them directions how they are to act in the emergencies which will be likely to occur.