Letter, from Henry Warburton to Sir John Herschel, dated at 45 Cadogan Place Autograph letter signed by sender. Further discussion of need for two constants [see Henry Warburton's 1854-[5]-11]. Sends first installment of errata Henry Warburton found in John Frederick William Herschel's [Examples of Finite Differences (1820)]. Realizes John Frederick William Herschel's duties [at Mint] afford little time to publish new edition. Suggests printing only errata list to first edition. 25 August 1854