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Comments on GS's 1865-6-1.
Returns a paper on Indian meteorology, as he cannot devote time to it.
A letter of introduction on behalf of the Prescott family.
Forwarding copy of paper by Ernst F. W. Klinkerfues; EK purports to show that movement of a star toward or away from an observer will affect its refraction in an achromatic prism.
Agrees with GS's assessment of Ernst Klinkerfüss's paper [see GS's 1866-2-27].
Comments further on Ernst Klinkerfüss's work [see JH's 1866-2-28]; on the behavior of light emitted by an electric spark.
Carefully describes how to pack actinometers being shipped to India.
Acknowledges receipt of paper on nebulae.
On a correction to a report [JH's obituary on William Whewell].
Describes problem with spectral lines in telescope while trying to understand William Huggins's results.
Comments on impossibility of increasing the intrinsic illumination of a source with a telescope; how to obtain the spectrum of red flames of the sun.
Believes that expensive telescope wanted by William Huggins is unnecessary for the intended purposes [see GS's 1867-5-3]; JH offers a telescope of his own to R.S.L.
Agrees reluctantly to write obituary notice of William Whewell; wishes he had been asked earlier.