When it is night-time or dark, can we distinguish objects? No; because all things are then without color, and they cannot be seen. As it grows light in the morning, what takes place? At first, we see the objects around us faintly; but as it grows lighter, we see them more distinctly. Do they all show the same color in the light? They do not; they show different colors. What enables us to see the color of different things? Light enables us to see the color of everything. What kinds of light have we? We have the light of the sun, moon, and stars; also, the light from the burning of any substance. Does the light show many colors? It does show many colors or shades of color. How may some colors be made? They may be made by mixing other colors together. How can we make a purple color? By mixing a red and a blue color together. How can a green color be made? By mixing a blue and a yellow color together. How can an orange color be made? By mixing a red and a yellow color together. How does the light come from the sun? It comes in rays or straight lines. What may be done with a ray of light? It may be separated into different colors. Into how many colors may a ray of light be separated? Into _seven_ colors, like the colors of the rainbow. What names are given to these colors? Red, orange, yellow, green, blue, indigo, violet. How may these colors be separated? By a prism, or three-sided piece of glass. How may this be done? If a sunbeam, shining through a hole in the window-shutter of a dark room, should fall upon a prism, it will be broken up as it passes through the prism, and be shown on the opposite wall, in the seven rainbow colors. [Illustration: Fig. 6.] In Fig. 6, D is a sunbeam passing through a shutter. When it passes through the prism, at E, it is separated into the seven rainbow colors, as is shown on the opposite wall. In what order will these colors appear? They will always appear one above the other, in the order named. How may this order be remembered? By the word Roy-g-biv, made from their initial letters, beginning at the bottom. From what are the colors of the rainbow made? From the rays of light coming from the sun. When is a rainbow seen? A rainbow is seen when the sun shines through the drops of water as they fall through the air. How do the drops of water help to make a rainbow? The drops of water act like little prisms, and separate the rays of light passing through them into the colors of the rainbow. What two things, then, are needed to make a rainbow? A shower of water, and a bright sunshine. In what part of the sky does the rainbow appear? In the part opposite to that in which the sun is, at the time of the shower. How does the rainbow appear? It appears like a great arch, spanning the sky, and its splendid bright colors are very beautiful. What may we remember in reference to the rainbow?