S.P.T.

June, 1912.




TABLE OF MATTERS

Contained in this Treatise


CHAPTER I.
On Rays Propagated in Straight Lines.

That Light is produced by a certain movement.

That no substance passes from the luminous object to the eyes.

That Light spreads spherically, almost as Sound does.

Whether Light takes time to spread.

Experience seeming to prove that it passes instantaneously.

Experience proving that it takes time.

How much its speed is greater than that of Sound.

In what the emission of Light differs from that of Sound.