Sending a descriptive pamphlet of an optical invention of his own for simple experiments with color.

News of the birth of her grandchild. Husband and two sons are gone back to Ceylon. Hazards and illness while travelling there.

Outlining his geometrical laws for the Great Pyramid.

Sending letter of Prof. Asa Gray. American Academy would like to acquire some of the back numbers of the publications of the R.A.S. Is grateful for JH's mention of his work on the chemical elements. Will be in London for a week or two.

Mentions a passage of Aristotle regarding comets. Proposes that Origen's theory of the Magi may be correct. Perhaps the Magi saw a comet.

May include JH's position on Neptune discovery in a new edition of Cycle of Celestial Objects. Will review objects catalogued in the volume with refractor.

Against changing location of Royal Observatory [from Greenwich], but will defer to opinion of [G. B. Airy] Astronomer Royal. Airy is most competent to judge situation. Still ill.

Is grateful for JH's assistance in obtaining back numbers of the publications of the R.A.S. Would like the chance to discuss his chemical experiments before the Royal Institution.

Thanks JH for supporting his proposed method of designating variable stars, adding that G. B. Airy, J. R. Hind, and W. H. Smyth also accept it. Hopes to succeed M. J. Johnson as director of Oxford's Radcliffe Observatory.

Is grateful for JH's intervention on his behalf. Comments on A. J. Beresford-Hope's review of his own book, and would be pleased if JH would pass on his comments.

Is obliged for letting him see Greenwood's letter about the book, but he did not himself write the review; it was written by an eminent scholar in that field.

Would like his opinion on the form to be adopted for the dedication.

Comments on his own work in optics and related fields.

Has heard that JH's son [Alexander] is observing variable stars at Charles Pritchard's school. Gives latest data on these stars. Suggests other variables to observe. Has adopted JH's proposal of using Julian day numbers for dating variables in his catalogue of variables.

Comments on, and encloses, a letter from JH's son William James, who has accepted responsibility for trying to resolve a grave situation [in India].

Has a copy of J. R. Young's investigation. Gives one of his own theorems.

Thanks JH for agreeing [1860-3-17] to be a subscriber to HS's project and for JH's critique of HS's use of the term 'Absolute.' Admits that it has difficulties.

Invites JH to stay at BP's home for the B.A.A.S. meeting 27 June. Notes the new museum opens at the same time.

Regarding the printing of JH's British Metrical scale. Comparison between the chimes of Big Ben and those of St. Mary's, Cambridge.

Further details on the chimes of Big Ben.