Purple eBooks

First of all it gives us the pure blue of the sky, one of the most
exquisitely beautiful colours in nature. It gives us also the glories
of the sunset and the sunrise, and all those brilliant hues seen in high
mountain regions. Half the beauty of the world would vanish with the
absence of dust. But, what is far more important than the colour of sky
and beauty of sunset, dust gives us also diffused daylight, or skylight,
that most equable, and soothing, and useful, of all illuminating
agencies. Without dust the sky would appear absolutely black, and the
stars would be visible even at noonday. The sky itself would therefore
give us no light. We should have bright glaring sunlight or intensely
dark shadows, with hardly any half-tones. From this cause alone the
world would be so totally different from what it is that all vegetable
and animal life would probably have developed into very different forms,
and even our own organisation would have been modified in order that we
might enjoy life in a world of such harsh and violent contrasts.


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