Letter, from Henry Warburton to Sir John Herschel, dated at 45 Cadogan Place Autograph letter signed by sender. Happy that John Frederick William Herschel may be leaving Mint and returning to scientific pursuits. Henry Warburton resumed work on equations in finite differences. Hopes to reconcile discrepancy between John Frederick William Herschel's and P. S. Laplace's solutions. John Frederick William Herschel's solution renders only particular, not general, solutions. 15 November 1854