THE STORY OF ARTIFICIAL SILK 
phernalia of Medical Science, but the whole 
of it does not atone for what we have lost 
by the diminution of sunlight and fresh air. 
We human beings are children of the Sun. 
The sunlight that comes to us through 
93,000,000 miles of space is our source of life. 
Lt is filtered through 100 miles of atmosphere 
and smoke and dust and cloud. It is not 
pure when it reaches us, but it is the power 
whereby we live. 
It is an extraordinary fact that we knew 
nothing about the composite nature of sun- 
light until two centuries ago. Sir Isaac 
Newton discovered it. He showed us for 
the first time the marvel of the spectrum. 
Then, in 1801, Ritter discovered the Ultra- 
Violet rays—the invisible rays of shortest 
wave-length. About 1850, Arnold Rickli, an 
Austrian, started the first Sunlight Clinic at 
Veldes, in Austria. He amazed the doctors 
by his success in healing diseases. 
In 187%, Dr. Downes and Dr. Blunt read 
papers on the healing power of Ultra-Violet 
rays before the Royal Society. In 18go, 
Koch proved that the bacilli of tuberculosis 
are killed by these rays. They are killed in 
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