were meant to be widely disseminated, and categorised the genre into six types: Marine, Mountainous, Pastoral, Historical, Architectural, and Elevated or Epic Pastoral. His printmaking was a major part of his output, and a museum is devoted to it, the Turner Museum in Sarasota, Florida, founded in 1974 by Douglass Montrose-Graem to house his collection of Turner prints. His early works, such as Tintern Abbey (1795), stay true to the traditions of English landscape. In Hannibal Crossing the Alps (1812), an emphasis on the destructive power of nature has already come into play. His distinctive style of painting, in which he used watercolour technique with oil paints, created lightness, fluency, and ephemeral atmospheric effects. In Turner's later years, he used oils ever more transparently and turned to an evocation of almost pure light by use of shimmering colour. A prime example of his mature style can be seen in Rain, Steam and Speed – The Great Western Railway, where the objects are barely recognisable. The intensity of hue and interest in evanescent light not only placed Turner's work in the vanguard of English painting but exerted an influence on art in France; the Impressionists, particularly Claude Monet, carefully studied his techniques. He is also generally regarded as a precursor of abstract painting. High levels of volcanic ash (from the eruption of Mount Tambora) in the atmosphere during 1816, the "Year Without a Summer", led to unusually spectacular sunsets during this period, and were an inspiration for some of Turner's work. John Ruskin said that an early patron, Thomas Monro, Principal Physician of Bedlam, and a collector and amateur artist, was a significant influence on Turner's style: His true master was Dr Monro; to the practical teaching of that first patron and the wise simplicity of method of watercolour study, in which he was disciplined by him and companioned by his friend Girtin, the healthy and constant development of the greater power is primarily to be attributed; the greatness of the power itself, it is impossible to over-estimate. Together with a number of young artists, Turner was able, in Monro's London house, to copy works of the major topographical draughtsmen of his time and perfect his skills in drawing. But the curious atmospherical effects and illusions of John Robert Cozens's watercolours, some of which were present in Monro's house, went far further than the neat renderings of topography. The solemn grandeur