24.6.1808 call on Mylius, w. M(ary) J(ane)
William Frederick Mylius bapt 1776 St Martin i t Fields, s. of Charles & Elizabeth. Ad in Morning Chronicle 11.1.1810 for books published by the Godwins, including Mylius's School Dictionary with preface by Edward Baldwin (pseudonym of William Godwin), and Junior Class Book by W F Mylius, Master of the Academy, Red Lion Sq. He was still alive in 1861 census Chelsea and perhaps in 1864 as voter in South Mimms, but I couldn't find a record of his death