Forwards a drawing of the great nebula of Orion, which he has just received from Angelo Secchi for JH. Quotes Secchi's remarks.

Proposes a principle for the establishment of musical scales to satisfy musicians, not mathematicians, as JH had apparently done.

Has made arrangements to have copies of solar autographs sent. Discusses sunspots. Inquires whether JH knows of the University of Lund in Sweden.

Thanks JH for calling AH's attention to 'mischievous & preposterous metric measure bill.' Will work to defeat it [in Parliament].

Thanks JH for his Familiar Lectures. Sends meteorological information.

Is graphically charting the sun and planets to compare them. Explains the lines and positions of bodies in his diagrams.

Working on rejection of metric bill [in Parliament]. Grateful for information provided by JH.

Problem of Irish church has forced postponement of Parliamentary discussion of metric bill until 13 May.

Sends copy of ST's Progress of Philosophy in the Past and in the Future.

Received JH's note. Will vote as JH advised. Bill is scheduled [to be read] on 13 May.

JH's account of his own health is much better than he hoped for. Has he seen AD's contribution to English?

[Printed notice] Invitation to meetings of 'Royal Geographical Society.'

Observations on various forms of [hemianopsia], which afflicts HA, his father [G. B. Airy], and JH. Detailed description of recent attack. Seven sketches with captions.

Thanks for JH's notes on metric system. Will study these before Parliamentary debate on 13 May. Calculates that 63 percent of exports go to British possessions, while only 18 percent go to Continent. Sees this as argument against introducing metric system.