Sending back part of manuscript [Mechanism of the Heavens] for criticism. Hopes Mrs. Herschel and baby are well.

Sends a method of estimating the variations in the elements of orbits during the perturbations in longitude and distance. Used it in manuscript when examining Saturn and Jupiter.

Asks JH to send the astronomical part of her manuscript [Mechanism of the Heavens] by Mr. Richards on Thursday.

Used a counter spell to keep the moon at a 'due distance.' Her previous computations were careless. Asks JH to return part of her manuscript [Mechanism of the Heavens] for corrections.

Wants to use method of indeterminate coefficients to integrate the differential equations of the planets' perturbations. [Originally written to W. Fairfax.]

Needs advice on integrating equations. Praises JH's book [Prelim. Discourse]. Says James Mackintosh and [Henry] Hallam also praise it. Note from William Somerville, which needs a reply, is enclosed.

Sends preliminary observations that will be prefixed to her book [Mechanism of the Heavens]. Wants JH to make any criticisms of it before it is published.

Asks JH to tell her where to find his newly published works on the action of light on chemical substances. Rome is not intellectually stimulating. Describes summer in Venice.

Will be in London and hopes to see JH. Thanks for his letter and the promise of sending his papers on light. Also wants information on [Louis] Daguerre's work.

Thanks JH for papers on light and photography. Enjoyed her visit to Collingwood. Feels privileged to be godmother to JH's daughter.

Discusses light experiments, which 'amused' her during summer. Has heard no scientific news lately. Describes summer in Rome.

Delighted that her paper was read at Royal Society. Discusses discovery of new planet [Neptune], and the future. Asks about his work.

Needs help understanding Percades [?] quantity. Inquires as to well-being of family and sends regards.

Thanks JH for critiquing her paper during his illness. MS's On the Connexion of the Physical Sciences is to be published in translation at Cesna.

Enjoyed visit of Louisa [Herschel Marshall]. Wants copies of JH's new articles. Is witnessing a solar eclipse, in which half the disc was covered, as she writes.

Thanks JH for scientific papers. Is writing about relations between inorganic matter, physical and vital forces, and microscopic plants. Praises [Giuseppe] Garibaldi and his performance.

Condolences on death of JH's daughter [Margaret] Louisa.

Cannot travel to London. Wishes she could return to her country and friends. Thankful for her health. Wants Herschels to visit Italy.

Has begun to write about science again after a long absence. Intended to revise small part of her On the Connexion of the Physical Sciences, but it became quite long. Wants JH's advice on it.

Introduces Signore Capellini, professor of geology at Bologna, to JH in letter. Asks JH to assist him in any way possible.