rain, the sun, and the eye. The rainbow is always seen by the eye that is between the rain and the body of the sun; hence if the sun is in the East and the rain is in the West it will appear on the rain in the West.
480.
When the air is condensed into rain it would produce a vacuum if the rest of the air did not prevent this by filling its place, as it does with a violent rush; and this is the wind which rises in the summer time, accompanied by heavy rain.
Of flower seeds.
481.
All the flowers which turn towards the sun perfect their seeds; but not the others; that is to say those which get only the reflection of the sun.
IX.
The Practice of Painting.
*It is hardly necessary to offer any excuses