Board of Longitude will meet at TY's home on Saturday.

JH is correct, and TY's 'little man is wrong.' Moon's apparent angular motion increases as spectator moves closer.

Repeat computation for Jupiter's satellite IV [see TY's 1824-4]. Explains W. H. Wollaston's 'blue bow.' See figure 422 of TY's [Lectures on Natural Philosophy].

As R.S.L. vice president, JH should reconsider his report favoring Eilhard Mitscherlich over W. H. Wollaston. This may be last opportunity to pay Wollaston a 'just compliment.' Agrees with JH that much in R.S.L. 'nicknamed science [is] sleight of hand,' and that 'great injustice is done to men of science.' But TY expects a short life and tries not to be concerned about approval of others.

TY would rather have JH's labor made useful another year. W. H. Wollaston does not want [Royal] medal, but medal wants Wollaston. One council member felt that TY's remarks offended JH. Assures JH it was not intended.

Math is flimsy in John Dalton's theory of vapor dispersion, but physical grounds are firm. Sends copy of TY's volume on sound. Modules of elasticity and tension are analogies to explain TY's doctrine. Presently studying modules of elasticity that do not apply to chimney pipes investigated by Daniel Bernoulli and J. H. Lambert.

Announces 2 June meeting of 'Commissioners for more effectually discovering the Longitude at Sea.' Inquired about 'excise,' but sees no reason to wait for Navy Board to act.

Ask Charles Babbage to send tables of logarithms to TY, who will compare them to [Brook] Taylor's. Bets that five errors will be found. Did JH order mountain barometer from [J. F.] Newman? Will inquire about [W. E.] Parry's instruments. Admiralty, not us, should order sextants.

Questions JH's conclusion that Board of Longitude has power to interfere in Admiralty operations. Disagrees that Nautical Almanac errors are serious. Compares them to tables of Charles Hutton, F. X. von Zach, and H. C. Schumacher. When will TY receive Charles Babbage's table?

[Board of Longitude] must answer to Parliament, not to public opinion. Do not contest the system. Order pocket sextants; they and barometer will be sent to Captain [Richard] Copeland. Knows how JH feels about expenses sent to Edward Sabine, but please write receipt and send it to TY within week. Will write directly to Charles Babbage for tables.

Suggests change in JH's table of refractions. Possible error in John Pond's reductions [illustration].

Errors in equinoctial time calculated by John Pond. Suggests limiting decimal places in value of equinoctial time to reflect this uncertainty. Making error uniform will make it awkward to alter future almanacs.

Resolved puzzle about sidereal year, which needs better definition. Error between true and nominal positions prevents TY adopting 'equinoctial time' for chronology investigations.

J. J. Littrow's paper in F. X. von Zach's April [Correspondence astronomique, géologique, hydrographique et statistique] is only 'a new hash' of [F. W.] Bessel and no improvement.

Send plan of furnace to TY or Michael Faraday before tomorrow's committee meeting.

No summary available.

No summary available.

'Our volume is nearly ready.' Problem dating vernal equinoxes before Christ's birth.

No summary available.

Board of Longitude will accomplish nothing by meeting before T. M. Brisbane comes to town, but TY suggests informal discussion, either at TY's or Henry Kater's.