Letter, from Sir John Herschel to Richard Sheepshanks, dated at Collingwood Autograph letter signed by sender. Thanks Richard Sheepshanks for the engraving [of John Frederick William Herschel's portrait?]. Who should receive copies? Suggests that the 'Knight of C. Hill' [Sir James South and his Campden Hill Observatory] 'is not worth your powder.' 14 September 1845