Comments on Josef Fraunhofer's work on double stars, on quality and color of light from different sources, refraction of different kinds of light, and solution of a problem in conic sections. Is going to Geneva and Modena soon.

Informs WS that the Astronomical Society has voted WS a gold medal for WS's observations of double stars. Says he is now observing nebulae. Confirms receipt of WS's fourth volume of observations sent by [E. C. F.?] Knorre. Asks WS to verify [Henry] Kater's observations on black zones in Saturn's outer ring.

Asks for JH's assistance in the acquiring of some astronomical equipment.

Thanks for the loan of his paper on the parallax. Regarding Wilhelm Struve's paper.

Berlin Academy plans a new Astronomical Chart. Thanks for JH's work on the double stars. Will see he has changed his address.

Has heard nothing from JH since he left the island. Would like to hear regarding the height of Etna and the latest comet.

Hopes that JH will visit Ireland and if he does that he will visit them. David Brewster also intends visiting Ireland.

JH will be presented with the Gold Medal of the Astronomical Society of London.

Further regarding parcels of books sent to G. S. G. Santini of Padova. Details and comments on telescopes used for observations.

Thanks for his valuable communications. His theory regarding the method of determining the difference of parallax is ingenious. Regarding the difference in observations of certain stars between Dublin and Greenwich. Returns G. A. A. Plana's letter and comments on this. Has not yet printed his paper on fixed stars.

Thanks for ME's letter; JH hopes to see her in Ireland in summer.

Asks for the use of an invariable pendulum and a clock from the Board of Longitude so that G. B. Airy and William Whewell can carry out experiments to measure the change in gravity and the mean density of the earth, in a Yorkshire coal mine.

Describes observations made as he travelled and people visited on journey from London to Ancona.

Has been waiting for a letter from Basil Hall regarding the availability of his pendulums, but has heard nothing. Surprised at the error in William Lambton's calculations. What does he think of the method of finding the figure of the earth by measuring the parallax of the moon? Is writing in bed. Has been polishing a mirror for T. J. Hussey.

Announces a new step to all astronomers toward understanding the solar system due to work of [Thomas] Clausen of the Altona observatory. Clausen recognized that the comet discovered by Biela was the same as that of 1805 and 1772. HS gives details of circumstances.

Has been transcribing his paper on suspensions. Comments on this and hopes it will be received by the council. Would like to know if his paper has been received.

Is sending his paper on the aberration so that it can be laid before the Board of Longitude. Also sending new table for the measurement of heights by means of the barometer. Regarding the distribution of the Memoirs to Associates.

Thanks for valuable communication, which will be laid before the Board of Longitude. Has completed own paper for the Astronomical Society. J. F. Encke has sent more copies of the proof-map. Ernesto Capocci's observations of the comet similar to his own. Has been unable to use Charles Tully's or John Ramage's telescopes yet owing to clouds.

Was favored with his letter. Comments on his paper and revised it. Hopes to be in town on Thursday. Believes [Stephen] Lee has the last number of Annales de chimie.

Wishes to print the observations WP presented to the R.S.L. in his forthcoming Journal. Can JH assist him; has obtained permission from Humphry Davy.