Is sending him a paper dealing with the measurement of the arc of the meridian between Greenwich and Paris. Further observations along the coast by Lieut. C. L. Largeteau.
Has just received his letter of 27 June. Further work of Lieut. C. L. Largeteau. Longitude readings at various points.
Still has not heard from publisher [see JG's 1825-6-23].
Encloses note about transportation of rockets, telescope, and chronometer, with suggested schedule for experiments.
Mostly involves arrangements about exchanges of papers and printing some of GP's in the Astronomical Society Memoirs.
Reports to JG on the publisher's response. JH offers JG financial assistance, telling JG 'I am rich,' JH's income being significantly greater than his needs.
Is grateful for the information on JH's illustrious father. Was ill when the letter arrived so hopes he will be excused for his belated reply.
News that he has been elected an Associate of the Astronomical Society gives him pleasure. Does not have much time at the present to devote to astronomy. Hopes to visit England to obtain materials for a life of Edmund Halley.
About the publisher's offer, and JG's intent to go to Göttingen for research purposes.
Reports on his meeting with Charles Bonne and their subsequent failure to see any signals the first night from either Mont Javoul or La Canche. Worries that the distances are too great for measurements so close to the sea. Speaks of similar measurements between Paris and Strasburg.
Reports his 'entire failure' with Charles Bonne to see signals from both La Canche and Mont Javoul on the same night. Tells of moving the telescopes to Tuniers on 1825-7-15. Speaks of similar experiments elsewhere, which also failed. Concludes that distance is not the only factor in distinguishing signals. Plans to visit JH on 1825-7-25.
On his contacts with French scientists and on their praise for the JH's and JS's catalogue of double stars. Suggests that JH, beset by excessive commitments, cease to devote time to seeing JS's publications through the press. Comments on the personal cost to JS of his devotion to double stars. Remarks on JH's efforts to measure the difference in longitude between the Greenwich and Paris observatories. Data on double stars.
Reports Charles Bonne's voyage to Mont Javoul and discovery that the rockets there had been sent off too early, accounting for the previous failures. Reports subsequent successes. Conveys his plans to arrive at Teneriffe.
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.
Apologizes for the long delay in writing of JH's election into the Danish Royal Academy of Sciences. HO is carrying on experiments with chlorine gas and metals.
Unable to call on him as his mother wishes to return home directly. Edward Sabine has not returned yet. Outlines some of the difficulties Sabine is experiencing. Premature to judge results at the moment.
Pleased that Astronomical Society will publish GP's memoir (in French) [see GP's 1825-5-27]. Adds some comments for clarification on points in paper and makes arrangements for copies of the paper.