Letter, from Henry Warburton to Sir John Herschel, dated at 45 Cadogan Place Autograph letter signed by sender. Thanks for comments on Henry Warburton's paper and work on properties of Bernoulli's numbers. Claims Henry Warburton's method of continued subtraction is convenient process for determining numerical coefficients. Found error, long perpetuated in literature, regarding Bernoulli's 13th number. Offers correct solution. 22 November 1847