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Glad for Mary's recovery. Congratulations on John's promotion to captain. Suggests method to study solar prominences without spectroscope. [Letter continues 15 June:] Alexander Herschel reports that G. B. Airy tried this method unsuccessfully long ago, but JH is sure it will work.
Received TW's book and approves simplicity and economy of its method of keeping time by using small fixed telescope to reduce star observations. Disapproves of using 'Dominical Letters.' Suggests using Julian dates.
Note to accompany an extract from JH's son John's letter, reporting on his observations of solar prominences.
Attached comments [not included] convey JH's views on MS's new manuscript [On Molecular and Microscopical Science, 1869]. Expresses reservations about MS's endorsement of current ideas of forces and their correlation and conservation.
Reports on paper [R.S.P.T., 159,. 575-] by [Thomas] Andrews on continuity of gaseous and liquid states of matter, believing it fit for publication.
About AD's health and the cold summer.
Concerned about AD's health. Offers theory of the constitution of matter.