Letter, from Richard Anthony Proctor to Sir John Herschel, dated at 5 Trigon Road, Kennington Autograph letter signed by sender. Sends map from his new atlas. Reports finding a region rich in bright stars in the northern hemisphere but distinct from the Milky Way. States that in a Royal Institution lecture, he will claim that telescopes cannot reach the limits of the sidereal system and that it is far more complex than traditionally assumed. 30 April 1870