Introduces botanist [Nathaniel] Wallich in letter. Any kindness shown him will be appreciated. Discusses some matters of geology.

Will visit WS after attending two R.S.L. committee meetings. Asks WS's opinion of usefulness of occultation information in the Nautical Almanac.

Thanks for JH's efforts on behalf of her son (Charles Babbage) on his election to the Lucasian professorship at Cambridge.

Informing him that he has been elected to the Lucasian professorship at Cambridge. Offers congratulations and gives views of other friends of his success. He should return to take up his appointment.

There may be a delay in supplying the copy of her book on fishes as she has to wait for a sufficient number of subscribers.

Would FB take the chair at the next meeting as he is busy nebulae-hunting. Regarding a printer for the papers of the Astronomical Society. Would like his own paper printed before June. Discusses J. J. Littrow's optical paper. Sends article on Light, which he has written for the Encyclopaedia Metropolitana.

Thanks for his paper on light. Regarding the meeting on Friday. Pendulums. Invitation to dine with him. Geological Society has been offered room; would like him to think about the possibility of one for the Astronomical Society.

Has not heard from Thomas Young about the reduction of the Parramatta Observations. James Dunlop will not carry out this work; best to leave it to the one named. Will be coming to London soon as the New South Wales Bill comes up, so will call on JH.

Babbage has been elected Lucasian Professor by a large majority. Is pleased by the unselfish service of JH to scientific research.

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.

Henry Kater not well [enough to travel] and requests committee meet at Kater's house. TY urges JH to verify W. H. Wollaston's measurement of refraction before republishing JH's essay. Diagrams Christiaan Huygens's principle of refraction. TY is making forms of aplanatic lenses.

Writes CB at Naples to inform CB that CB has been elected Lucasian Professor at Cambridge. Urges CB to write to thank the electors.

Charles Babbage has been elected to Cambridge's Lucasian professorship. Thanks JH for his efforts. Hopes Babbage will fill it effectively.

Sending the Memoires of the Académie.

Thanks for fourth volume of "English Flora". Intends to stay in London till the Linnean Society anniversary meeting as the meetings of other societies and London dining hours are too late. Death of Daniel Moore FLS of Lincoln's Inn. Astonished by sudden disappearance of Mr Simmons of Paddington House, wonders if his flight was caused by ruinous speculation; recalls that Sir William Adams [(1783-1827)] the oculist committed suicide after being ruined by speculating in Mexican mines. Mrs Cullum possibly return to England with his son this summer.

A note at the end states that this letter was erroneously dated Monday 17 April 1828; it should have been written 17 March 1828.