Has returned from London. A preprint of JS's and JH's paper on double stars has been delivered to François Arago. Is finding many errata in their paper. Has received a letter from Josef Fraunhofer and the paper [on double stars] of Wilhelm Struve.

His laborious Monday: collected plants for his lecture, accompanied by Mrs Edward Forster; gave his lecture; attended a fraught Linnean Society audit and Council due to the quarrels with [Joseph] Sabine, but conciliated after [Alexander] Macleay and himself lectured [David] Don [(1799-1841), botanist]. Anniversary meeting and dinner well attended, though Sabine did not attend; conflicts between [James] Bicheno and [John] Lindley [(1799-1865), botanist]. Is to attend, with Forster, the annual meeting of Chimney Sweepers, who want to outlaw use of children in the profession. Next staying at Miss Lloyd's lodgings at Chapel Place. Sitting for [Francis Leggatt] Chantrey [(1781-1841), sculptor] on return from Bristol. His dentist is Mr Cartwright. Professor [Thomas] Martyn has mouth cancer. Edward Taylors moving to London.

Not upset that JH withdrew WR's paper on photometer from R.S.L. Sent similar paper to David Brewster's [Edinburgh Journal of Science] with note on JH's method for finding relative heating power of solar rays. Wants to dedicate WR's book on light and heat to JH.