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Updated: May 27, 2025
As stated at the time, this discovery ushered in the darkest hour in the fortunes of the wave theory. But the darkness did not continue. In 1811 Arago discovered the splendid chromatic phenomena which we have had illustrated by the deportment of plates of gypsum in polarized light; he also discovered the rotation of the plane of polarization by quartz-crystals.
My father said that, if it touched a doctor when he was going through, it would hurt his spirit, and when he returned home he would sicken and die. On the other side we saw Baiame sitting in his camp. He was a very great old man with a long beard. He sat with his legs under him, and from his shoulders extended two great quartz-crystals to the sky above him.
Through this glass the beam from the polarizer now passes, being intercepted by the Nicol in front. On exciting the magnet light instantly appears upon the screen. By the action of the magnet upon the heavy glass the plane of vibration is caused to rotate, the light being thus enabled to get through the analyzer. The two classes into which quartz-crystals are divided have been already mentioned.
He placed two large quartz-crystals against my breast, and they vanished into me. I do not know how they went, but I felt them going through me like warmth. This was to make me clever, and able to bring things up." They looked like ice, and the water tasted sweet. After that, I used to see things that my mother could not see.
Throughout the process you notice one feature which is perfectly unalterable, and that is, angular magnitude. The spiculæ branch from the trunk, and from these branches others shoot; but the angles enclosed by the spiculæ are unalterable. In like manner you may find alum-crystals, quartz-crystals, and all other crystals, distorted in shape.
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