Asks JH to advise about where in London to buy a good chronometer for a friend.

Details about the chronometer order [see JL's 1830-11-29].

Is grateful for news. Please order a chronometer from Robert Molyneux. Is pleased to hear JH has resumed work on the nebulae again. Would like agreement on stating latitude and time. Would like to send some more memoirs for the R.A.S. No news from Hamburg.

Sends this letter by an Armenian minister from Vienna, who would like to become acquainted with prominent men and institutions of England. He will also carry back the gold chronometer for His Excellency. Will send payment for the chronometer as soon as he knows the amount due. JH's work on Light has made a great impression. Will any of JH's countrymen be attending the Vienna meeting in September?

Sends two articles for the R.A.S. Gained much pleasure from reading JH's Prelim. Discourse. If JH has written any other books for Lardner's Cabinet Cyclopaedia, he would be glad to receive copies. Work on Light has made great impression. Has Charles Babbage finished his Logs. yet? Cholera prevalent in Vienna.

JL was elected associate of Astronomical Society. Received JL's books and papers. Will send Society's Transactions. John Pond gave permission to test Robert Molyneux's clock at Royal Observatory. Questions F. G. W. Struve's transit determinations of double stars. Pond discovered errors in Greenwich transit instrument and places little dependence on its observations since late 1819. Sends John Brinkley's analysis [of April 1821 comet observed by Basil Hall in southern hemisphere]. Asks about Halley's Comet and parallax. Wants information on object glasses of 6-inch diameter or greater. Requests copy of JL's annual published observations.

Thanks for the publications sent; lists materials JH is sending JL. Asks about quality of Josef Fraunhofer's large telescopes. JH read part of JL's letter of 2 Jan. 1822 at Astronomical Society meeting. Discusses proper motion of sun, JL's work on latitude of the pole star, observatory clocks, micrometers, and the Cambridge Observatory.

Has just heard that the ship carrying JL's clock arrived at Hamburg on the 5th. Gives the name of the Bank to which payment is to be made. Has used his Theory of Comets in a paper.

Receipt and shipment of various papers and letters. Robert Molyneux has not received payment for clock. JH ordered another for L. A. Fallon; it is ready to ship. Clarifies Edward Sabine's remark about pendulums. Hopes to translate JL's Analytical Geometry. JH translated JL's 'empirical formula of refraction.' Believes JL's method of determining latitude without knowing the time is not new. Notes J. W. A. Pfaff's translation of William Herschel's works.

Approves of the plan for the observatory. Comments on some of the features. Good equatorial is a necessity. Will try to obtain a copy of the plan of the Cambridge Observatory.

Has just returned from abroad and found his letter of April awaiting him. Hoped to visit Vienna when abroad. Has received money for the clock. Hopes to send his own paper on double stars later. Encloses some papers for distribution. Measured height of Etna when in Italy. Met Josef Fraunhofer and had an instructive discussion with him.

Discusses JH's efforts to send various publications to JL and to receive publications from JL. Hopes Franz von Gruithuisen, whose 'strange' lunar observations are causing controversy, will come to England with his telescope. Discusses JH's progress in preparing a catalog of nebulae.

Has been overwhelmed with work, which accounts for the delay in writing. Thanks for communications. Both are now printed. Comments on some of the points raised.