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Writes to clarify his understanding of the word 'fluorescence.' Asks JH to review a paper on color-blindness.
Further thoughts [see GS's 1856-6-27] on the nature of fluorescence, including that it is a transient phosphorescence.
Continues comments on fluorescence from letter of 1856-7-8; then shows mathematically that JH's solution for the problem of Mahomet's coffin [see GS's 1856-7-1] will not work.
Comments on one of the magnetism experiments JH described in his letter of 1856-7-14.
Sends [William?] Pole's paper on color blindness, in case JH wishes to examine it.
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Says that Council of R.S.L. will reconsider whether William Pole's paper on color-blindness should be published.
Comments on the effect of intensity of illumination on the distinctness of the spectrum.
Comments about reflective power of metals.
Further comments on subject of GS's 1859-11-10; comments on several experiments involving light and color.
Partial repeat of letter of 1859-11-10, together with some considerations about the molecular behavior producing fluorescence.
Referring to some experiments in sound, GS proceeds to provide the theoretical basis for them.