On his new paper for Royal Society on a point of leaf arrangement. Asks CD to communicate it and "gives some details of its contents", e.g., recorded observations of changing leaf-order on individual specimens.

Comments on a paper by George Henslow ["Helianthus tuberosus", Trans. Linn. Soc. Lond. 26 (1876): 647].

Sends article on temporary color-blindness. G. B. Airy's book on sound [On Sound and Atmospheric Vibrations] is finished.

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.

JH's approval encourages HA to publish account [of hemianopsia]. JH may keep HA's drawings. Notes on attack suffered by JH.

Writing about [hemianopsia] for doctor's thesis at Cambridge. Asks permission to quote report of JH's attack [see JH's 1868-5-4].

Received JH's permission to quote JH [in HA's thesis on hemianopsia] and describe JH's latest attack, including 'patches of coloured checquer work.'

Describes difficulties in producing glass pen and attaching it to pendulum to produce precise curves for aligning equatorial [telescope mount]. Sent artistic sample to JH's wife.