It was during his period at Whittington he wrote the bulk of his published works and founded the first public library in Oswestry. In 1863–1868 he brought out a Commentary on the Four Gospels and he also wrote a manual for the Holy Communion. Published by the Society for Promoting Christian Knowledge during the 1890s under the title "Holy Communion, Preparation and Companion...together with the Collects, Epistles and Gospels" this book was widely distributed and many copies still survive today. In the movement for infusing new spiritual life into the church services, especially among the poor, How was a great force. He took a stand against what he regarded as immoral literature and Thomas Hardy claimed that he had burned a copy of his novel Jude the Obscure. How was much helped in his earlier work by his wife, Frances A. Douglas.
Contributions to botany
Walsham How "had an excellent knowledge of the British flora." In 1857 he was one of the founders of the Oswestry and Welshpool Naturalists' Field Club and Archaeological Society. He was at one time its president, and he contributed a paper on "The Botany of Great Orme's Head". He was also the botanical contributor to The Gossiping Guide for Wales. In 1890 he was president of the Yorkshire Naturalists' Union. His obituary in respect of his contribution to botany was published in the October 1897 issue of The Naturalist.
Church work
He refused preferment on several occasions, but his energy and success made him well known, and in 1879 he was consecrated a bishop, by Archibald Campbell Tait, Archbishop of Canterbury, on 25 July at St Paul's Cathedral; he became the first modern suffragan bishop in London, under the title of Bishop of Bedford, his province being the East End. There he became the inspiring influence of a revival of church work. He founded the East London Church Fund, and enlisted a large band of enthusiastic helpers, his popularity among all classes being immense. He was particularly fond of children, and was commonly called the children's bishop. When he came to East London in 1879 "he found great need of women's help for the poor in the huge parishes of his diocese". He then planned to establish a Deaconess Community and applied to the London Diocesan Deaconess Institution. LDDI sent its Sister Louisa in autumn 1880 and the East London Diocesan Deaconess Institution was founded at Sutton Place, Hackney. Deaconess Sisters worked in various East London parishes and eventually the Institution became the All Saints Deaconess Home at Meynell Crescent. A few of the remaining Sisters joined the London Diocesan Deaconess Institution which continued work in the East End for a few years.
Bishopric
In 1888 he was made the first bishop of Wakefield, and in the north of England he continued to do valuable work. His sermons were straightforward, earnest and attractive; and besides publishing several volumes of these, he wrote a good deal of verse, including such well-known hymns as Who is this so weak and helpless, Lord, Thy children guide and keep and For All the Saints. As bishop he consecrated many churches, including the Church of St John the Divine, Calder Grove in 1892.
Death
He died while on holiday in Ireland, on 10 August 1897 in Leenane, County Mayo. Although there is a marble memorial to him in Wakefield Cathedral, he was buried in Whittington, Shropshire, where he had been rector for 28 years. There is also a memorial plaque to him inside the London city church of St Helen's, Bishopsgate, bearing the line "Sweet is the calm of Paradise the blest" from his hymn, "For all the saints".
Hymns
How is represented in The Church Hymn Book with three hymns:
How appears as a significant character in Bernard Pomerance's 1979 Broadway playThe Elephant Man. In a 1982 television adaptation he was played by William Hutt.
