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Updated: May 7, 2025
Its visible portion covers a range of about one octave; bolometric indications already in 1884 comprised between three and four. The great importance of the newly explored region appears from the fact that three-fourths of the entire energy of sunlight reside in the infra-red, while scarcely more than one-hundredth part of that amount is found in the better known ultra-violet space.
Confirmatory evidence of the extraordinary promptitude with which our satellite parts with heat already to some extent appropriated, was afforded by Professor Langley's bolometric observations at Allegheny of the partial eclipse of September 23, 1885. Yet it is certain that the moon sends us a perceptible quantity of heat on its own account, besides simply throwing back solar radiations.
I bought a microscope and peered into tissues, pollen cells, diatoms, ditch ooze; and pitied my clever and very talented grandmother who died ignorant of the family secrets revealed by 'totemism', ignorant of 'parthenogenesis' which proved so conclusively the truth of her own firm conviction, that the faults she deplored in her son's children were all inherited directly from her daughter-in-law, whom she detested; ignorant of the fact that the sun which she regarded as a dazzling yellow fire was by bolometric measures shown to be in reality of a restful, and refreshing blue color.
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