[Illustration: FIGS. 227-234.--Motion.] For this a good blackboard and a few colored chalks are all the material necessary. The blackboard is a most excellent thing upon which to practise, but it is much better to use large sheets of yellowish-brown paper. This paper is known as chalk-talk paper, and has “tooth” enough to retain the chalk, and make every stroke tell. Figs. 217 and 218 show how to make a Drawing-Board, upon which to fasten the paper. Fig. 217 shows the front view. Fig. 218 the rear view. The drawing-board can be made of any size to suit the artist, but should always be large enough to give full sweep to the arm. Size of Board. To get these proportions take a piece of charcoal in your hand and stand at arm’s length from the wall, with your right side toward it, and without changing your position, or leaning forward, make a mark as high upon the wall as you can reach. In the same manner make a mark as low as you can reach, without stooping. Swing your arm from left to right, make two marks midway between and upon each side of the first marks. This will give you the full extent of your reach. It is well to allow a foot more, each way, for a margin. This will give the proper proportion for the drawing-board. The board must be made of soft, smooth pine boards, so matched that there will be no cracks to annoy you while drawing. The Height of the Easel can be obtained by measuring from the floor to the top mark on the wall, and allowing a foot more for the margin. The easel is made by screwing two leg-boards on the back of the drawing-board (Fig. 217), and then, with a hinge in the middle of the top edge of the drawing-board, attaching the third or hind leg (Fig. 218). Tack the Paper securely, at the top and bottom, to the drawing-board, spread your colored chalks out on the table, and group the colors so that they will be handy, and when you want any color you will waste no time seeking that particular lump of chalk (Fig. 219). Keep a Sharp Knife handy, on the table, so that as soon as the audience has seen one picture you can run the point of the knife along the bottom of the paper, just above the tacks, free the lower edge of the drawing, throw it up and over the top of the easel, without taking time to detach it at the top. You are then ready to begin upon a new drawing. [Illustration: Figs. 235-239.] The Drawings Themselves must be simple, but with practice some very effective designs can be made with a few rapid strokes, which at a distance will look like finished paintings. You may Begin Your Talk by drawing a vertical line AB (Fig. 220). As soon as this is done you must _step aside, so that all the audience may see_ what you have drawn, and while they are looking at the line tell them that you are going to give them a talk upon the character of lines, and what the lines represent. [Illustration: FIGS. 240-242] AB conveys the idea of A Stationary Object