the eye of the spectator.
The number of the images produced by the flash of lightning on the waves of the water were multiplied in proportion to the distance of the spectator's eye.
So also the number of the images was diminished in proportion as they were nearer the eye which saw them [Footnote 22. 23: Com'e provato. See Vol. II, Nos. 874-878 and 892-901], as it has been proved in the definition of the luminosity of the moon, and of our marine horizon when the sun's rays are reflected in it and the eye which receives the reflection is remote from the sea.
VI.
THE ARTIST'S MATERIALS.
Of chalk and paper (612—617).
612.
To make points [crayons] for colouring dry. Temper with a little wax and do not dry it; which wax you must dissolve with water: so that when the white lead is