Letter, from Frederick Howlett to Sir John Herschel, dated at St. Augustine's, Hurst Green Autograph letter signed by sender. Hopes the John Frederick William Herschel's are all well. Would like an eye-piece made by Mr. Cook[e] or any leading optician on the principles of John Frederick William Herschel as laid down in his paper in Philosophical Transactions of the Royal Society Shall he refer the optician to this paper? 27 April 1864