Of course the whole plan will fall flat if the teacher wholly delegates to his scholars any or all of these lines of work. He also must invite the strangers, if he expects his scholars to do so. He also must seek for new members, if he would inspire them to do the same. Without his sociableness they will soon become frigid. The teacher alone has the dipper of water that starts the pump. Any contrivance that lessens his responsibility lessens his success. But the plan I have outlined has value, not because it permits the teacher to do less, but because it incites the scholars to do vastly more. An ounce drawn out is better than a ton put in. One thing you get them to do is a greater triumph than a dozen things you do much better for them. Chapter XXX Through Eye-Gate Before his listless and restless audience the lecturer took in his hand a piece of chalk, turned to the blackboard, and touched it. Instantly he had the eager attention of all. He did nothing with the chalk; had not intended to do anything; he carried his point with it, nevertheless. A teacher, plus a bit of chalk, is two teachers. And any one may double himself thus, if he choose to take a little pains. Surely there need be no hesitation as to the materials. If you can have a blackboard, that is fine. I myself like best a board fastened to the wall, and a second board hinged to this after the fashion of a double slate. The outside may be used for "standing matter," and the inside opened up for the surprises. But this is a great luxury. A portable, flexible blackboard will answer, if your class is away from the wall. You can roll it up and carry it home to practise there. You can use both sides of it. Such blackboards may be obtained now for two dollars. Not even a flexible blackboard, however, is essential. A slate will serve you admirably, and some of the best chalk-talkers use simple sheets of manilla paper tacked to ordinary pine boards. Then, as to the chalk, by all means use colored crayons. It is easy to learn effective contrasts of colors, and bright hues will increase many fold the attractiveness of your pictures and diagrams. But these crayons need not be of the square variety, sold especially for such work at thirty-five cents a box. They produce beautiful results, but the ordinary schoolroom box of assorted colors will serve your turn admirably and cost much less.