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Sends copy of letter to Leverrier [9/16/4]. Leverrier, Neptune. Dr. Nicols book on Neptune. Airy's Gravitation.

Pierce's Perturbations of Uranus. J.C.A's On the perturbations of Uranus. [Neptune].

Asks for the 3rd Volume of Lacroix (1) and as many numbers of the Ecole Polytechnic as possible to be requisitioned from Babbage's (2) Master and sent to Herschel as soon as possible. Gives news of mutual acquaintance, Graham, and his father. Discusses the printing of the 'A.S.'

(1) An elementary treatise on the differential and integral calculus by S. F. Lacroix, translated by Herschel from the French and printed in 1816.

(2) Charles Babbage the mathematician

Asks Whittaker not to send all the volumes of Ecole Polytechnic, but only the relevant ones. Thanks Whittaker for his letter and will write as soon as he has time to compose a suitable letter.

Also attached is autographed letter from Herschel to Greenwood. Asks Greenwood jokingly to compose a piece of music in 5/4 time. Tells of his musical mania. Asks for a recommendation for a musical text book

Laughs at Whittaker's expense about his forthcoming examinations. Asks for any news on Cambridge to be sent as soon as possible. Tells of decision to become a lawyer. Gives humourous advise respecting Whittaker's conduct in the Senate House. Notes an equation he has solved

Tells of the weakened condition of his father. Asks for news of Jones and tells of sending a paper of Brownhead's to J. Banks at the Royal Society. Recounts recent visit to Torquay with Babbage and how that reinvigorated his analytical faculties. Gives news of Peacock and Babbage. States that he will send the appendix to Lacroix

Asks for information regarding a 'fish-eye-stone' (a crystal) which Lowry has sent to Herschel

Mentions death of Clark, the support Herschel can offer to Henslow in the forthcoming elections at Cambridge (1) and the settling of an account.

(1) Probably refers to the election of John Stevens Henslow to the chair of Mineralogy in 1822

Gives permission to use his letters in the 'Battle of the Standards'. (1) Asks for 100 copies so Herschel can send them to M.P.s.

(1) An attempt to instigate the use of metric measurements which Herschel campaigned against

Contents:

1. Essay; 'Sound'

2. Essay; 'Light' (2nd half of essay - mostly sections on polarized light)

3. Comet orbits

4. Part III of 'On the Theory of the Moon'

5. Part I of 'Light' with doodles and a letter from Lardner.

6. A notebook for the section 'reflexion of light'

7. On letters from South