elliptical-light

a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.

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"Getting up some time after midnight to collect the scattered brands together, while my companions were sound asleep, I observed, partly in the fire, which had ceased to blaze, a perfectly regular elliptical ring of light, about five inches in its shortest diameter, six or seven in its longer, and from one eighth to one quarter of an inch wide. It was fully as bright as the fire, but not reddish or scarlet, like a coal, but a white and slumbering light, like the glow-worm's. I could tell it from the fire only by its whiteness. I saw at once that it must be phosphorescent wood, which I had so often heard of, but never chanced to see. Putting my finger on it, with a little hesitation, I found that it was a piece of dead moose-wood (Acer striatum).... Using my knife, I discovered that the light proceeded from that portion of the sap-wood immediately under the bark, and thus presented a regular ring at the end, which, indeed, appeared raised above the level of the wood, and when I pared off the bark and cut into the sap, it was all aglow along the log."

-Henry David Thoreau

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elliptical-light

elliptical light