Quotation from: General Science

Written by: Bertha M. Clark


The particles of heat-giving and light-giving bodies are in a state of
rapid vibration, and thereby disturb the surrounding medium, which
transmits or conveys the disturbance to the earth or to other objects
by a train of waves. When these waves reach their destination, the
sensation of light or heat is produced.


We see the water waves, but we can never see with the eye the heat and
light waves which roll in to us from that far-distant source, the sun.
We can be sure of them only through their effect on our bodies, and by
the visible work they do.

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