Letter, from Richard Anthony Proctor to Sir John Herschel, dated at 5 Trigon Road, Kennington Autograph letter signed by sender. Cites various celestial appearances as a basis for concluding that the Milky Way takes the form, not of a disk or ring, but of a series of convolutions. Urges that the nebulae form part of the Milky Way rather than being separate universes, as many had suggested. Asks John Frederick William Herschel to critique these ideas. 24 July 1869