Is quite prepared to contribute an article on Light by 1830 for DL's Cyclopaedia. Would like William Whewell as the contributor on Sound. Suggests other names. Would not like to use colored plates as they are so poor. Gives him an idea of the style of engraving.

Comments on a paper about differential calculus, prepared by Mr. Knight, which JH confesses he does not understand. Adds some astronomical observations JH made at Slough before leaving there, and noting the appearance of J. F. Encke's Berlin Ephemeris concludes with 'England is fated to lag in the rear of all her neighbours—at least in science.'

Gives references to good sources on astronomical projections. Discusses this subject and also logarithmic tables.

Thanking her for the information on the anonymous letter. Would like a printed copy. Will write an answering letter to the Times.

In response to an article in The Record, JH writes to The Times to explain what has happened to date regarding the expenditure of public funds for the calculating devices of Charles Babbage, who was then out of England.

Is now prepared to write a signed article on light requested by DL [see JH's 1828-7-25]; JH encourages DL to ask William Whewell, W. H. Fitton, and George Peacock to write as well; recommends against use of color printing of pictures as the reproduction is too poor.

Encourages TY to publish 1829 supplement to Nautical Almanac. JH originally proposed supplement to introduce improvements that would bring N. A. to be like Encke's Ephemeris. That is all ended now. English are dropping behind French and Germans in science. JH refuses to accept money from government 'which treats its agents so cavalierly.' Reduction of Parramatta [Australia] observations. Did not see TY's paper in W. T. Brande's [Quarterly Journal of Science and Art], but objects to substitution of true for mean equinox.