Letter, from Edmund Wheeler to Sir John Herschel, dated at 48 Tollington Road, Holloway Autograph letter signed by sender. Offers to lecture to John Frederick William Herschel's 'association.' Describes microscope equipment designed by EW and son, who now manufactures portable telescopes. Diagrams and questions about new object glasses and compound lenses. Offers free telescope to Alexander Herschel. Progress of Atlantic Cable offers good lecture topic for next session. 22 July 1865