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?
We may remember that God set his “bow” in the cloud, as a token that the world should no more be destroyed by a flood of waters.
Where else may we see a variety of colors?
In the soap-bubble.
Why are these colors constantly changing?
Because the walls of the bubble are constantly growing thinner, and different colors are, therefore, reflected from them.
Why do the walls of the soap-bubble grow thinner?