Describes, using a diagram, how the solar protuberances appeared to him as a color-blind person when he observed a solar eclipse.
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Describes, using a diagram, how the solar protuberances appeared to him as a color-blind person when he observed a solar eclipse.
Thanks for note of 29 [July]. Expresses doubt over accuracy of his observations of a solar eclipse. Stresses the necessity of careful comparison of various observations. Asks JH's opinion of a photograph with prominences greater and corona less than supposed.
Sends his certificate for the R.S.L. to JH to sign.
No summary available.
No summary available.
Thanks JH for his note. Asks that JH's paper on scales [1868 'On Musical Scales'] be made available to him.
In Variation CD mentions colour-blindness in women. WP does not believe there are any proven cases.
Notices in letter of last May JH's postscript about the rate of color blindness occurring to overworked or ill artists, and doubts it becomes di-chromic, but merely a 'weakness' of vision.