Letter, from Carl Friedrich Gauss to Sir John Herschel, dated at Göttingen Autograph letter signed by sender. Has been absent the whole summer and fears that his letter acknowledging his election to the Astronomical Society may have gone astray. Is grateful for the honor. Sends a paper of his own on a new method of making observations with the heliotrope. Comments on the usefulness of this instrument. 10 November 1821