Has not been able to secure any angles of Gamma Virginis due to poor weather. Perplexed over the difference between J. H. Mädler and W. R. Dawes. George Bishop will be pleased to send any measures he may require.

Has a sufficient quantity of heavy glass at his disposal and offers some to JH.

Printed notice of thanks for memoir presented by JH.

Circular announcing that [Theodor] Brorsen in Kiel has discovered a new comet. HS adds note that F. W. Bessel has died.

Thanks for the Cometen Circular. Observations of comets he has recently carried out. Thanks for the book on the telescope of William Parsons (3rd Earl of Rosse).

Discovered an agent that renders his paper tough and waterproof. Sends sample for JH's inspection. Treated paper is highly explosive and can discharge a gun.

Received JH's check for £300 for Harris family. Measurements of Gamma Virginis made by W. R. Dawes under GB's direction. Will send future observations to JH.

Will be showing some experiments in the laboratory next Monday to G. B. Airy, François Marcet, and a few others; JH would be welcome.

William Mann returns to England still in poor health. Expresses concern over running of Edinburgh Observatory by C. P. Symth. Regrets poor data from Cape Observatory on Comet of 1843. Observed Comet Gambert. Situation with Caffres hostile.

The first volume of JM's Logic has been printed and the printers require what is ready of the second volume. In Book Three would like comments from JH regarding the difference with P. S. Laplace's theories.

Sending a letter for a Benjamin Peirce, one of the professors at the University of Cambridge (Mass.). EE has just assumed the presidency of this university.

Returns the account of Lord Rosse's telescope with many thanks. Weather has not been good for observations, but gives some observations on the comets.

Planning to edit a volume of hexameter verse translations. Wishes to include JH's translation of Friedrich Schiller's 'The Walk.'

Has been pursuing his magnetic experiments with crystals and will be publishing a memoir on them. Comments on these experiment. Is there a difference in the mass of the earth at the poles?

Describes conditions and instruments at Edinburgh Observatory. Observatory assistant Alexander Wallace works on reduction of Thomas Henderson's transit observations.

Sending a German translation of an unfinished work of HO. Regrets that so few people can read the Danish language. Is grateful for JH's papers.

JH's second letter has convinced him. Has now written a new conclusion to the chapter showing the principles of P. S. Laplace in a new light. Does not think Laplace's example is a fair type. Has already rewritten the chapter on the Doctrine of Chances.

Receives report on poor state of Paramatta Observatory. Encloses letter from Thomas Brisbane, who believes James Dunlop should be removed from his post of authority there.

Sends copy of James Graham's letter concerning transfer of Paramatta Observatory to government authority. Thanks JH for advice on the matter. Discusses methods of magnitude estimation.

Smith, Elder & Co. received JH's revised proofs. Encloses page of 'Reduced Observations' for JH's approval. Details of printing process.