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The ultra-microscopical vesicles filled with air in all probability give rise to the opalescence which is so marked a property of the substance. Their size is such as to scatter and throw back the rays at the blue end of the spectrum and to transmit those at the red end.
"I, as an Immortal, desire to make a few simple and decisive statements to you to-night regarding the nature of the Blue Disease, the germ of which was prepared by myself and my friend, Dr. Richard Harden. The germ in future to be known as the Sarakoff-Harden bacillus is ultra-microscopical. It grows in practically every medium with great ease.
The bacillus was ultra-microscopical that is, it could not be seen, even with the highest power, under the microscope. Its presence was only to be detected by the blue stain it gave off during its growth. The Birmingham reservoirs are a chain of lakes artificially produced by damming up the River Elan, a tributary of the Wye.
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