While the sonnet had now been adapted into a general-purpose form of great flexibility, by the end of the 19th century later writers had begun introducing their own variations. "Modern Love" (1862) by George Meredith is a collection of fifty 16-line sonnets about the failure of his first marriage. Several major sonnets by Gerard Manley Hopkins, such as "The Windhover", were written in long-lined sprung rhythm, and he was also responsible for sonnet variants such as the 10-line curtal sonnet "Pied Beauty" and the 24-line caudate sonnet "That Nature is a Heraclitean Fire". Hopkins' poetry was, however, not published until 1918.