Regarding the sun's equation. Sun spots.

Sending a short paper which is to be printed, and would be glad with any comments. Currents indicated are deduced for a small number of cases only.

Thanks for his comments on the recent paper. Further points on the sun's equation. Will read his article on meteorology. Radcliffe Trustees have advertised the post again as there was only three applicants.

James Challis has proposed retiring from Cambridge Observatory. Would like JH's views on the matter of his chances of succeeding Challis.

Has no means of knowing what course the University of Cambridge will take in the event of the resignation of James Challis. Hopes that RC will not cease from his astronomical labors.

James Challis has informed him that J. C. Adams is to be the new Observer at Cambridge. Does not see how he himself can ever obtain the post. Seems likely that he may give up the profession.

Has heard that JH has to decide if the illustrations to his own paper on sun spots are necessary. Thinks they are of vital importance.

Is grateful for JH's report on his paper. Regarding the plates for this paper.

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).

Copy of RC's book will be sent to JH from R.S.L. Thanks JH's son for letter.

Thanks for sending the paper in the Quarterly Journal. Comments on the importance of some of the points raised.

If RC's formulas for sunspots are correct, then 'trade-wind theory' is challenged and sun's photosphere may behave as envelope circulating around sun according to laws of planetary motion. Questions formula relating to sunspot velocity.