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JH responds with an assessment of the Indian observatories [see GA's 1866-9-24].
About William Whewell's accident, and the ideas of E. F. W. Klinkerfüss on the behavior of light due to the motion of a star source.
Comments on the state of William Whewell's health, and about the theories of E. F. W. Klinkerfüss [see JH's 1866-2-27].
Comments on the quality of the star catalogue of Charles Rümker [see John Wrottesley's 1866-4-16].
Comments on Charles Rümker's observations and agrees to a meeting [see John Wrottesley's 1866-5-12].
Responds to meeting arrangements [see GA's 1866-5-24].
A note to accompany forwarding of papers and letters relating to Charles Rümker's observations [see GA's 1866-5-31].
Comments on William Whewell's replacement on the Royal Observatory's Board of Visitors.
Not well enough to attend Visitation Day at the Royal Observatory, but would be pleased if GA would invite JH's son John.
Has sent the 1854 Greenwich Magnetical and Meteorological Observations. Illness of the Master of Trinity College, Cambridge (William Whewell). Undulating theory of stars in motion.
Further regarding the possible introduction of the metrical system for weights and measures.
Regarding the measurement of the heat and light of the sun by means of the movements of a comet.
Regarding JH's remarks on Robert Willis. Comments on the usefulness of W. H. Miller of Cambridge.
Regarding the documents for the Standards Commission.
Is sending a packet of seven papers on metrical and decimal systems.
Regarding the visit by E. A. S. Seymour (12th Duke of Somerset) to the Board of Visitors.
New date for proposed meeting on the Charles [=K. L. C.] Rümker business.
Regarding visitation card for the Royal Observatory for JH's son John.
Wants a paper for the R.A.S. on the Corona star [T Coronae].