The Rainbow and the Snake.
So the rainbow is connected with the snake, being the fume of a gigantic serpent blown up from underground. In Persia it was called the “celestial serpent.” We have already seen that the Milky Way is regarded as the path of the Nâgas in the sky. It is possibly under the influence of the association of the snake, a treasure guardian, that the English children run to find where the rainbow meets the earth, and expect to find a crock of gold buried at its base.[146]