Needs Zeitschrift volume; then JH may have it back [see JS's 1864-1-15]. JH's article should be 10-12 pages. Compliments JH's writings as popular without being 'popularising.'
Needs Zeitschrift volume; then JH may have it back [see JS's 1864-1-15]. JH's article should be 10-12 pages. Compliments JH's writings as popular without being 'popularising.'
RC's book [Observations of the Spots on the Sun] is done. First copy, exhibited at R.A.S. last week, was well reported in R.A.S.M.N. Will send copy to JH.
Formulas for determining rotation rates of sunspots relative to latitude on solar surface. Believes equatorial parts of photosphere are dragged faster than others. Speculates on rotation rate of solid body below (if such exists).
Gratitude for JH's gift of Caroline Herschel's autograph manuscripts to R.A.S.
Received JH's two letters acknowledging receipt of 'Volume of Tables of Heights' of the Great Trigonometrical Survey of India. Hopes to visit JH and discuss phenomenon of terrestrial refraction. Received valuable assistance on tables from JH's son John.
Asks that consideration be given to 'wishes of the Cadet' in selecting a regiment for him.
In response to the gift of a book, JH comments on the philosophy of knowledge, and goes on to say that JH agrees with [John Stuart ?] Mill's rejection of the syllogism as a means of argument. In the postscript, JH comments on the nature of heat.
About geodesic books and JH's encouragement to John to keep asking questions; indeed JH is almost insistent on son John's writing to JH with questions, book needs, and confidences. JH also talks about finding the arithmetical mean of a number of observations. [Also included is the 1st page of a letter to John from one of his sisters.]
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A letter to Miels Berkeley from Joseph Hooker thanking him for information about G. Baker and mentioning that they had recently been to see Dr John Paget for a diagnosis.
JDH writes to inform his uncle [Reverend John Gunn] that H. Christy will send him a set of [geological] specimens from the Dordogne cave, which illustrate the strata where relics of man are found. They will be sent through Falconer. JDH wishes to show Gunn some of his Wedgwood pottery: a plaque by John Flaxman showing Achilles & Hector at Troy, a medallion of Mitten & Erasmus by Goldsmith, & one of the Prince & Princess of Wales along with 40 other portraits. In a note added under the signature he adds that Grove has told him about flint implements found in a cave at Bethlehem.
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