LONDON.- This exhibition of 42 paintings draws on the Royal Collection’s rich holdings of Dutch 17th-century landscapes, including works by Jacob van Ruisdael, Aelbert Cuyp, Jan van der Heyden and Meyndert Hobbema. By the 17th century, landscape painting was well established as a distinct art form and one in which Netherlandish artists excelled. The fine detail and meticulous finish of Dutch pictures appealed to British taste, and 34 of the works in the exhibition were acquired by the future George IV between 1809 and 1820. The ability of Dutch artists to depict mood and emotion through landscape and the subject-matter drawn from everyday life influenced the great British painters John Constable and JMW Turner. Constable admired the ‘acres of sky expressed’ in Ruisdael’s Evening Landscape: A Windmill by a Stream, and on seeing a seascape by Willem van de Velde the Younger, Turner remarked, &#145