This, then, is the reason that the chalk talk method of teaching is so lastingly impressive.
Happily, it adapts itself to the requirements of a chalk talk.
The most inexpensive paper for chalk talk work is the kind on which newspapers are printed.
In this book (and in your chalk talk work) the same thought applies.
I once saw a "chalk talk" given to two hundred Sunday-school children.
Your pencil outline holds the same relation to your chalk talk that the minister's notes hold to his sermon.
The chalk talk here outlined contains in its illustration an interesting transformation which always commands close attention.