Urges RM to read The Times for the previous day.

Requests that HS look for a shipment of a clock and send it on to J. J. Littrow, and inform the maker in London, Robert Molyneux, that HS has done this. JH sends along John Pond's catalogue of star position differences.

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.'

A letter of introduction to AQ on behalf of John Franklin [famous explorer of the Northwest Passage].

Sends EP a copy of the first annual report of [Astronomical Society?] and invites EP to join the 'circle'.

Provides a detailed critique of a mathematical paper by [J. M. H.] Wronski, which JP presented on Wronski's behalf to the R.S.L. Suggests that JP urge Wronski to withdraw the paper.

Introduces [C. T.] Largeteau from France, who wishes to receive from JP the observations made at Greenwich as part of the determination of the difference in longitude between the Greenwich and Paris observatories. Recounts some difficulties encountered in making the measurements.

Discusses the construction of JR's telescope. Mentions a number of material changes that must be made if it is to be used for sweeping [see JR's 1826-9-30].

Presented WR's paper on a new photometer to R.S.L. Discusses how objections may be avoided. Believes [John] Leslie's photometer should be thrown aside.

Will present alterations of WR's paper to R.S.L. [see JH's 1825-1-27]. Asks if he may describe the similarities between WR's photometer and an instrument JH used in Italy and Sicily.

Requests particulars concerning the electors for position at University of Virginia for which William Ritchie has applied. Encloses Ritchie's letter of 1827-12-6.

Congratulates TR on his volume of astronomical observations. Skeptical about alleged changes in Orion nebula. Feels better telescopes and drawings would be needed to confirm this. Discusses own double star observations.

Comments on ES's measurement [in his Account of Experiments to Determine the Figure of the Earth] indicating 'the increase of the fraction expressing the earth's compression.' Predicts that ES's result will cause a 'sensation,' but does not commit himself to it.

Asks AS to send him plagiedral quartz for experimentation. Unable to commence Cornish expeditions with Charles Babbage. Requests AS discuss publication of their [JH's, George Peacock's, and Babbage's] book with Peacock.

Responds to ES's proposal to conduct a series of meteorological observations from the peak of Teneriffe. Promises to bring it before the Board of Longitude for consideration for support.

Sends directions for chrome solution and the magnetic apparatus and instructions for its use, as requested [in WS's 1826-8-2]. Discusses experiments with magnets.

Invites the Somervilles to dinner the following week.

Responds to ES's letter of 1825-4-4, stating that JH now understands that ES will proceed with the Teneriffe observations only if funds are provided. Praises Sabine's previous work.

On 1825-4-7 presented ES's proposal for experiments at Teneriffe to the Board of Longitude, which judged the experiments not sufficiently relevant to the Board's concerns. Offers to seek endorsement from the R.S.L.

Invites ES to join him and other scientists for dinner. Requests that ES prepare a detailed description and justification of his proposed Teneriffe experiments for consideration by the R.S.L. Council.