Letter, from George Biddell Airy to Sir John Herschel, dated at Observatory, Cambridge Autograph letter signed by sender. Summary of George Biddell Airy's 1834-4-24, with additional information that he has written a book entitled Gravitation. Confusion over 42 Virginis. Affair between James South, and Edward Troughton and William Simms has been referred to arbitration. Experiments on Newton's rings by transmission. Letter to Thomas Maclear about his mural circle. Saw the eclipse of 16 July. Tarnish of John Frederick William Herschel's mirrors. R. A. Cauchoix's delay with telescope. [The final two pages of this letter are from Richarda Airy to Margaret Brodie Herschel.] 20 June 1834