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But since the Naples variety contains a certain amount of ordinary green pigment, and since the Trieste variety is tolerably sure to contain some algae, both spectroscopists have been operating on a mixture of two wholly distinct pigments diatom-yellow and anthea-green. But what is the physiological relationship of the plants and animal thus so curiously and intimately associated?
And, as if for the very purpose of throwing light upon this interesting question, an event of the most striking character occurred in the heavens, almost as soon as the spectroscopists were prepared to interpret it correctly. On the 12th of May, 1866, a great conflagration, infinitely larger than that of London or Moscow, was announced.
Skillful spectroscopists succeeded in detecting and delineating the lines that were peculiar to each substance. By burning such substances in flame, they were able to produce the lines, and thus verify results.
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