The yellow substance turns out to be pentasulfide of arsenic, with a slight excess of sulfur; comments on its properties.
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The yellow substance turns out to be pentasulfide of arsenic, with a slight excess of sulfur; comments on its properties.
Thanks for the photographic notes and for the remarks on color blindness. The remarks on the composition of colors interested him as he has difficulty in distinguishing shades of brown and green.
WM's friend William Huggins is a candidate for the fellowship of the R.S.L. and would be pleased for JH's support. Please return the certificate to WM when he has signed.
The Meteorological Committee of the R.S.L. is about to commence publishing the summary of the observation collected from the seven observatories. Would like JH's advice on method of publishing the barometric observations.
Offers possible explanations to account for discrepancies between assays of WM and of Thomas Graham.