Letter, from Reginald Stuart Poole to Sir John Herschel, dated at 1 West Terrace, Worthing Autograph letter signed by sender. Being able to conclude only that J. B. Biot was wrong in his conclusion, Reginald Stuart Poole cannot make computation (per John Frederick William Herschel's request) about heliacal rising himself. Has applied to G. B. Airy to do it. Expresses difficulty in attaining accuracy about any ancient author's recording of a rising. 2 March 1852