Letter, from Philip Jennings to Sir John Herschel, dated at Hampstead Autograph letter signed by sender. Much indebted for his kind letter, but is unable to interfere in the affairs of Sir Francis Knowles as he has no contact with him. Encloses a list of instruments belonging to the late W. C. Holford and would be pleased if John Frederick William Herschel would show it to his astronomical friends. 11 February 1840