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Thanks GS for a number of his papers on railway bridge fractures, gravitation, and the spectrum.
Replies to several queries about papers of JH. JH describes the accidental production of some interesting copper salt crystals.
Thanks GS for his paper on fluorescent spectra; JH is interested in having these rays used on quartz, hoping to find his 'thermic' rays acting.
Writes to acknowledge receipt of a testimonial on behalf of [George] Wilson.