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It streaked upward, wavering from side to side and making the golden walls visible in a ghostly fashion. It shivered in a hasty rhythm. Aten groaned, almost sobbed. There was another flash of that unbearable actinic flame. A thermit-thrower was in action. Then a third flash. This was farther away. The tumult died suddenly, but the green light-beam continued its motion.
All the phenomena of colour and of polarization observable in the case of skylight are manifested by those actinic clouds; and they exhibit additional phenomena which it would be neither convenient to pursue, nor perhaps possible to detect, in the actual firmament.
The clean air of this new world had done its work, the actinic sun had painted her with the colors of the luckier woman, who expects to live and to be loved. It was a lovely face she might have seen in yonder mirror a face flushed as she heard this step at the door. "Greetings and salutations!" said he as he entered. "Of course you know who I am." "I'm trained in hide-and-seek," said she.
And I am not sure but that sympathy is love's own self, vitalized mayhap by some divine actinic ray. Only a thorn-crowned, bleeding Christ could win the adoration of the world. Only the souls who have suffered are well loved. Thus does Golgotha find its recompense. Hark ye and take courage, ye who are in bonds!
A very brief exposure is likely to prove fatal. It should be added that some people stand these actinic rays better than others. Such being the case, mere temperature tables could have little interest to the general reader. I append a few statistics, selected from many, and illustrative of the different conditions. Locality.
The same phenomenon is exhibited in perfection by our actinic clouds, the only condition necessary to its production being the smallness of the particles. In all cases, and with all substances, the cloud formed at the commencement, when the precipitated particles are sufficiently fine, is blue.
The latter is not for aesthetic effect, but to intercept actinic rays. It is eight or ten inches wide, is shaped to button close up under your collar, and extends halfway down your back. In addition it is well to wear a silk handkerchief around the neck; as the spine and back of the head seem to be the most vulnerable to the sun. For breeches, suit yourself as to material.
Finsen had not heard of it, and was much interested. Evidently they had been groping toward the truth. How they came upon the idea is not the only mystery of that strange day, for they knew nothing of actinic rays or sunlight analyzed. But Finsen calmly invited the test, which was speedy in coming.
The signal has been sounded too grave for the ear of the sailor at the masthead and his comrades on the deck who nevertheless feel its vibrations in the ship as the stones of a cathedral are stirred by the bass of the organ. "As with sounds, so with colors. At each end of the solar spectrum the chemist can detect the presence of what are known as 'actinic' rays.
He would fain have photographed the interior of the cavern but was reluctantly forced to forgo the gratification of this desire, from inability to produce artificial light of the necessary actinic value. But, to compensate for this disappointment, he spent no less than three days in the cavern, making sketches and voluminous notes.
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