Letter, from Henry Warburton to Sir John Herschel, dated at 45 Cadogan Place Autograph letter signed by sender. Admires chimes analogy in John Frederick William Herschel's 'On Circulating Functions' [1818]. Resumed interest in partitions of numbers in development of periodic functions. Finds John Frederick William Herschel's method superior. Encourages him to publish it. Henry Warburton and Augustus De Morgan developed original method, which Henry Warburton erred in attributing to Leonhard Euler. De Morgan's paper to Cambridge [Philosophical] Society demonstrates theorem leading to proof of Euler's theorem. 24 February 1850