Letter, from John Murray [Jr.] to Sir John Herschel, dated at 50 Albemarle St. Autograph letter signed by sender. Has heard from Mrs. Greig [wife of Woronzow Greig] that John Frederick William Herschel has consented to read the proof sheets of Mrs. Mary Somerville's work on molecular science. Sends the first 44 pages and would be pleased for any comments. Mrs. Somerville is in Naples. 25 July 1868